Chapter Summaries

Mia awoke as a baby in the wizarding world as Harry Potter’s twin sister and grew up with him under the Dursleys’ care. At the zoo, Harry accidentally used magic and was locked away by Uncle, while Mia brought him food and comforted him.

• Mia realized she had been reborn as Harry’s infant twin, and Snape reluctantly left the children at the Dursleys’ doorstep.
• Mia and Harry grew up neglected by the Dursleys, and Mia eventually received a small room of her own when she was seven.
• On Dudley’s birthday, Mia comforted Harry and took over his breakfast chores before the family went to the zoo.
• Harry accidentally released a snake with magic, and Mia discovered that he could talk to snakes.
• After Harry trapped Dudley inside the snake enclosure, Uncle locked Harry away for a week, and Mia secretly brought him food.

Mia and Harry received their Hogwarts letters, but the Dursleys tried to keep them from going. On their eleventh birthday, Hagrid found them at the seaside hut, revealed the truth about their parents, and took them away.

• Mia and Harry found their Hogwarts acceptance letters in the mail and hid them, but Dudley seized them and showed them to the Dursleys.
• The Dursleys locked Mia and Harry in separate rooms and destroyed the Hogwarts letters that kept arriving.
• The Dursleys took the siblings to a hut on an isolated rock, where they celebrated their eleventh birthday together.
• Hagrid broke into the hut, gave Mia and Harry a birthday cake, and introduced himself as Hogwarts’ Keeper of Keys and Grounds.
• Uncle Vernon and Aunt Petunia admitted they had known about the siblings’ magical heritage, and Hagrid corrected their claim that Lily and James had died in a car crash.
• Hagrid gave Dudley a pig’s tail and took Mia and Harry away.

Hagrid took Harry and Mia to Diagon Alley to buy their Hogwarts supplies, where they learned about Harry’s fame and collected money from their family vault. At Ollivander’s shop, Mia found a powerful elder wood wand, and Ollivander predicted that she would attract the wizarding world’s attention.

• Hagrid brought Harry and Mia to the Leaky Cauldron, where wizards recognized the siblings and Quirrell met them.
• Hagrid opened the entrance to Diagon Alley and took the siblings to Gringotts, where they collected Galleons from their family vaults.
• Hagrid retrieved a mysterious package from vault 713 and refused to tell Harry and Mia what it contained.
• Harry chose a wand at Ollivander’s shop, then Mia tried several wands before an elder wood wand with a dragon heartstring core chose her.
• Ollivander explained the wand’s power and difficult nature, and Mia declared that she and the wand would be the best partners.

Harry and Mia received birthday gifts from Hagrid, learned about Voldemort, and traveled to Hogwarts on the Hogwarts Express. On the train, they met Ron and Hermione, and Mia began getting to know Hermione.

• Hagrid gave Harry a white owl and Mia a black cat, then told them that Voldemort had survived Lily and James's deaths but had lost his strength.
• At the station, Mia and Harry followed the Weasleys through the barrier to Platform Nine and Three-Quarters and boarded the Hogwarts Express.
• Ron joined Harry and Mia in their compartment and asked to see Harry's scar.
• Mia's cat Luna pounced on Ron's rat, Scabbers, and Mia suspected that the rat was Peter in Animagus form.
• Hermione repaired Harry's glasses with Reparo, and Mia introduced herself and asked to be friends.

Harry, Mia, Ron, and Hermione arrived at Hogwarts and met Draco Malfoy before the Sorting Ceremony began. Harry was sorted into Gryffindor, while Mia's sorting remained undecided as the chapter ended.

• Hagrid led the first-years across the lake to Hogwarts, where Professor McGonagall welcomed them and explained the houses.
• Mia defended Slytherin against Ron's prejudice, and Draco Malfoy introduced himself, insulted Ron, and tried to recruit Harry before Harry rejected his offer.
• Mia noticed Dumbledore watching her and Harry, while Snape stared at her from the staff table.
• Hermione was sorted into Gryffindor, Draco into Slytherin, and Ron into Gryffindor.
• The Sorting Hat hesitated between Gryffindor and Slytherin for Harry, then placed him in Gryffindor after he asked for it.

Mia Potter was sorted into Slytherin and began settling into her new house, where Draco and several classmates welcomed her. After spending the night in the Slytherin dormitory, she reassured Harry that she was doing well before returning to her classmates for Potions.

• The Sorting Hat placed Mia Potter in Slytherin, and Draco welcomed her to the house table.
• Dumbledore announced the school rules, including the Forbidden Forest and the dangerous third-floor corridor, while Mia looked forward to exploring them.
• The Slytherin Prefects led Mia and the first-years to the dungeons, where Mia received a room to herself.
• Draco introduced Mia to Blaise Zabini, Daphne Greengrass, Pansy Parkinson, Theodore Nott, and the others before they went to breakfast.
• Harry pulled Mia aside at breakfast and worried that Slytherins might bully her, but Mia reassured him and returned to Draco before Potions.

Mia answered Snape’s potion questions and brewed a successful Cure for Boils with Draco while Snape repeatedly targeted Harry and Gryffindor. Neville’s cauldron exploded, injuring nearby students, but Draco pulled Mia out of danger before Snape led the injured to the Hospital Wing.

• Mia asked a portrait for directions, and the group reached the Potions Classroom in the dungeons.
• Snape questioned Harry, then called on Mia, who correctly answered his questions and earned two points for Slytherin.
• Mia and Draco brewed a Cure for Boils together, and Snape praised Mia’s potion and awarded Slytherin five points.
• Neville’s cauldron exploded after he added Porcupine Quills over the flame, and Draco pulled Mia away from the splashing potion.
• Snape blamed Harry, took ten points from Gryffindor, and led the injured students to the Hospital Wing after Mia urged him to help them.
• Mia checked that Harry was unharmed, and the students hurried out when class ended.

Mia finished her homework with Hermione, then explored Hogwarts at night and encountered Fluffy before nearly being caught by Filch. The Weasley Twins rescued her, shared their map of the castle’s secret passages, and invited her to join their prank team.

• Mia finished her homework in the library, helped Hermione with her Potions essay, and thought about practicing Transfiguration in the Room of Requirement.
• After the library closed, Mia cast the Disillusionment Charm and explored Hogwarts, then unlocked the fourth-floor room where Fluffy guarded a trapdoor.
• Mia tried to make Fluffy obey her, decided to return with meat, and left when it grew late.
• Filch and Mrs. Norris nearly discovered Mia, but the Weasley Twins pulled her through a moving wall and hid her.
• Mia exchanged jokes with Fred and George, copied their map of the castle’s secret passages, and agreed to join their prank team.

Mia befriended Fluffy with pastries and returned the next day to a quiet Slytherin common room, where she confronted students who insulted her and her family. After Mia defeated them in a duel, Snape punished the other students and assigned Mia evening detentions with him.

• Mia fed Fluffy pastries, petted him, and promised to visit again with more treats.
• Mia and Theodore heard Pansy, Daphne, and their followers insult Mia and her family in the common room.
• Mia challenged the group after they called her a half-breed, then defeated them with a series of spells and prepared to make them drink her potion.
• A student fetched Snape, who hurried to the common room and questioned the students about the fight.
• Snape gave the students involved six months of detention, ordered them to apologize, deducted fifty Slytherin points, and assigned Mia evening detentions in his office.

After Mia was bullied by Slytherins, Harry worried over her, but she convinced him not to seek a house transfer. Mia earned points in class and caught Professor McGonagall’s attention, while Dumbledore discussed her talents and her encounter with the three-headed dog.

• Harry rushed to Mia with Ron and Hermione, then accepted her promise to handle herself rather than leave Slytherin.
• Draco warned Daphne and Pansy, the students apologized, and Slytherin lost fifty points, prompting its students to compete eagerly for points.
• Mia and Hermione answered questions and completed practical work in Herbology, earning praise from Professor Sprout.
• Mia mistook Professor McGonagall in cat form for a pet, then impressed her by transfiguring a match into a needle.
• Professor McGonagall invited Mia to study with her on Saturday evenings.
• McGonagall told Dumbledore about Mia’s talent, and Dumbledore suggested taking her to meet Newt.

Mia joined Fred and George in a month of pranks after hearing exaggerated stories about her fight with Slytherins. She and the twins escaped after prank candy changed students’ voices, leaving the Great Hall laughing together.

• Fred and George told Mia increasingly exaggerated versions of rumors about her defeating a group of Slytherins, including stories and books inspired by the incident.
• Mia and the twins pranked Pansy, Daphne, and other Slytherins for a month, leaving them wary when Mia approached their table.
• Mia greeted Draco, then hugged Hermione before teasing Harry and giving candy to Harry and Ron.
• The candy changed Draco’s voice to a ducklike squawk and Ron’s to a mature woman’s voice, while Harry realized Mia had pranked him too.
• Mia, Fred, and George fled the Great Hall as the affected students laughed together, and the professors watched with amusement.

Mia impressed Professor Flitwick in Charms, avoided Quirrell’s attempt to lure her to his office, and began studying Felix Felicis with Snape. Afterward, she continued her private lessons with Professor McGonagall and asked about becoming an Animagus.

• Mia cast Incendio perfectly in Charms, earning five points for Slytherin.
• Mia refused Quirrell’s invitation to visit his office, while Voldemort ordered Quirrell to make her serve him.
• During detention, Mia attempted to brew Felix Felicis and succeeded in the first stage after Snape corrected her mistake.
• Snape taught Mia his advanced potion-making experience before sending her back to rest.
• Mia asked Professor McGonagall about Animagi and was warned not to attempt the dangerous process herself.

Students discussed Professor Snape’s apparent favoritism toward Mia Potter, who received his patient guidance and care while brewing Felix Felicis. After taking a break, Mia practiced Expecto Patronum in the Room of Requirement but failed to produce one, then demonstrated wandless magic by restoring a shattered vase.

• A young badger told others that Snape treated Mia Potter differently from Harry Potter, citing his praise for her in Potions and his punishment of students who fought her.
• Snape found Mia after she defeated upper-year Slytherins, assigned her detention in his office, and later patiently guided her through advanced potions.
• Mia brewed Felix Felicis under Snape’s guidance and gave him the potion with a wish that luck would always favor him.
• Mia went to the Room of Requirement and repeatedly failed to cast Expecto Patronum despite practicing for a week.
• Mia shattered a vase with her wand, then restored it by directing her magic without using her wand.

Mia struggled to stay awake in class and at dinner, where Draco shared treats made by Narcissa especially for her. She showed Harry the Daily Prophet’s report about a break-in at Gringotts, then left to rest before Flying Class.

• Mia fell asleep during Professor Binns's History of Magic lesson, and Draco woke her after class ended.
• At dinner, Draco caught Mia as she nearly nodded off, and Theodore withdrew his hand after seeing Draco help her.
• Hedwig delivered Mia's Daily Prophet, which reported that someone had broken into Gringotts and entered Vault 713.
• Draco shared Narcissa's homemade treats with Mia and invited her to visit Malfoy Manor.
• Mia brought the treats and newspaper to Harry, Hermione, Ron, Fred, and George, and Harry recognized the significance of Vault 713.
• Mia watched Neville's Remembrall turn red, said goodbye to her friends, and went back to rest before Flying Class.

During Flying Class, Mia used magic to save Neville after his broom went out of control. Harry and Draco then disobeyed Madam Hooch and flew after Neville’s Remembrall, and the chapter ended with Mia scolding Harry after he caught it.

• Madam Hooch began Flying Class, and Harry, Mia, and Draco successfully summoned their brooms while Hermione struggled and Ron’s broom hit him.
• Neville’s broom flew out of control, and Mia used Wingardium Leviosa and Protego to stop his fall before Madam Hooch took him to the hospital wing.
• Draco picked up Neville’s Remembrall and mocked him, then flew after Harry when Harry chased the Remembrall.
• Mia followed Harry on her broom as he caught the Remembrall outside Professor McGonagall’s window.
• Mia scolded Harry for flying recklessly, and Draco guiltily admitted nothing but rubbed his nose under her glare.

Harry and Draco tried to make up with Mia after she gave them the cold shoulder for several days, while Harry learned he had been chosen as Gryffindor’s Seeker. After Mia led Harry, Hermione, and Ron into the forbidden fourth-floor corridor, they encountered Fluffy, who recognized her and tried to pounce.

• McGonagall summoned Harry from the Quidditch pitch, and he later told Mia that he had been picked for the house team.
• Mia ignored Harry and Draco, so they brought her food and snacks and pleaded for her to forgive them.
• The twins and Ron congratulated Harry on becoming the youngest Seeker, and Hermione showed them James Potter’s Seeker trophy.
• Mia, Harry, Hermione, and Ron got lost after the staircase shifted and entered the forbidden fourth-floor corridor.
• Mia unlocked a door and ushered everyone inside, where they found Fluffy; when the three-headed dog recognized Mia and lunged toward her, Harry grabbed her and ran out.

During Astronomy, Mia and Draco reconciled and grew closer, while Hufflepuff students watched and shipped them. Later, Mia visited the Hogwarts Kitchen and met Cedric Diggory, leaving after sharing a late-night meal with him.

• Draco offered Mia his robe, and she cast a Warming Charm over the freezing students before forgiving him and taking his hand.
• Mia struggled with her star chart, and Draco helped her identify constellations as nearby Hufflepuffs secretly celebrated their pairing.
• Mia called Draco “Little Dragon,” making him blush before he fled Astronomy, while Blaise questioned Mia and Theodore left quietly.
• After training, Mia used the twins’ map to find the Hogwarts Kitchen, where House-elf Duomi prepared food for her.
• Cedric arrived for a late-night meal, introduced himself to Mia, and shared food with her before she declined his offer to walk her back.

Mia joined Harry’s Quidditch practice with Ron and Hermione, where Wood initially tried to send her away. After she stopped a Quaffle flying toward them, Wood admired her reflexes but left without asking her to join the team.

• Mia went with Harry to Gryffindor’s Quidditch practice, bringing Ron and Hermione along.
• Wood objected to Mia watching, but Harry and the Weasley Twins persuaded him to let her stay.
• Mia and Hermione made warming bottles, watched the team practice, and discussed their advanced reading while Ron reacted in disbelief.
• A Quaffle flew toward the stands, and Mia shoved Ron and Hermione aside before stopping it with her wand.
• Wood apologized and checked whether anyone was hurt, then left after admiring Mia’s reflexes.

Mia found Voldemort drinking a unicorn’s blood in the Forbidden Forest and fought him through Quirrell, but he escaped after Dumbledore and the professors arrived. Fawkes healed Mia, and Firenze led the professors into the forest to meet some of his friends.

• Mia went into the Forbidden Forest to collect Acromantula fangs and blood, then found Voldemort drinking from a dying unicorn.
• Mia attacked Voldemort and Quirrell, who fought back with the Cruciatus Curse, while Voldemort ordered Quirrell not to kill her.
• Dumbledore summoned the professors after detecting Unforgivable Curses, and they found Mia dueling Quirrell in the forest.
• Quirrell struck Mia and escaped after Snape hit him with Sectumsempra, while McGonagall demanded an explanation from Mia.
• Fawkes healed Mia with his tears, and Firenze arrived and invited the professors to meet his friends.

Mia reunited with the injured unicorn and earned the trust of the herd, convincing the professors that she had tried to save it. After the professors punished her for entering the Forbidden Forest, Snape took Mia for a checkup and offered to teach her magic and give her access to the Restricted Section.

• The unicorns welcomed Mia, and one willingly gave her blood as a blessing.
• Firenze told the professors that Mia had saved the unicorn and might change outcomes that were already set.
• Dumbledore assigned Mia a month of Trophy Room cleaning, but Firenze's account of her help against the Acromantulas led him to extend the punishment to three months.
• Snape took Mia to Madam Pomfrey, where the checkup showed she was unharmed.
• Snape warned Mia to avoid danger and use Unforgivable Curses only when necessary, then offered to teach her spells and write her a Restricted Section permission slip.