Looking at Dumbledore's and Snape's expressions.
Douglas took a deep breath and began his perfectly reasonable deductions again:
"Yes, I do have a suspicion, but it's only a suspicion. I don't have any evidence.
"Before term started, I happened to learn a few things from Mr. Arthur Weasley and Harry.
"Certain actions by the Ministry of Magic forced Mr. Lucius Malfoy to dispose of some Dark Magic objects from his home.
"Harry happened to spot him while he was in Knockturn Alley..."
Snape frowned, then gave a disdainful snort:
"Knockturn Alley?
"Hmph! Our Chosen One has actually sunk so low as to visit a place like that.
"He should have been expelled at the start of term."
Douglas glanced at him. If you want to know, just ask. Why ask in such a roundabout way?
So, under Professor Snape's displeased gaze, Douglas continued his deductions.
"Harry saw Lucius Malfoy and his son Draco Malfoy selling things in Knockturn Alley.
"Oh, hold on, that isn't the main point yet.
"Harry later mentioned another important piece of information. This summer, he received a warning letter about using magic outside school.
"But Harry said it was actually caused by a house-elf called Dobby, who wanted to stop him from returning to Hogwarts.
"According to him, that house-elf told him his life would be in danger if he returned to school...
"Later, while chatting with Mr. Draco Malfoy, I happened to hear him mention that his family's house-elf was called Dobby..."
Snape and Dumbledore exchanged a glance.
Then Snape sneered:
"According to you, the person who found the Chamber of Secrets should be a Slytherin student, perhaps even Mr. Malfoy himself.
"Why would it be a Ravenclaw student? That doesn't make sense."
Snap!
Douglas snapped his fingers, looking as though they had finally asked