The information on the letter tied all the clues together, confirmed what the little girl had said, and supplied the final missing piece of the puzzle.
The nightmare's owner had ignored his maternal grandfather's warnings and accidentally released Behind the Door. The ghost first swapped bodies with his younger sister, then killed the other family members and visitors.
To stop the ghost from killing anyone else, the nightmare's owner had chosen to sacrifice himself, imprisoning the ghost inside his own mind. He had become a vegetative patient as a result, suffering the ghost's torment day and night.
The Middle Nightmare presented everything in a way that was both realistic and absurd. Every person and object that appeared in the dream symbolized something.
"I think I understand now. There's just one more thing I need to work out."
"The House Owner controls the Manor and has the key to the Hidden Room, but he didn't destroy the envelope or the clues. He sealed them away instead. Could he still be planning to use them for something?"
Normally, Behind the Door would have no chance to escape before the nightmare's owner physically died. Unfortunately, the Brain Development Department of Eternal Life Pharmaceuticals had discovered the nightmare's owner. Every time they sent Testers into this nightmare, they gave Behind the Door another opportunity to escape.
"Behind the Door once swapped souls with the younger sister. There's a good chance he'll try the same method to escape the nightmare."
At first, Gao Ming had suspected that Bai Huang was the person the House Owner had chosen to swap with. She had displayed all sorts of strange behavior after returning last night, and now she had appeared in the Hidden Room wearing the nightmare owner's mother's clothes. But on further reflection, the abnormalities were far