1. First, open the game "The Chamber of Secrets Escaped 22 Scares at Sea", find Patricia Xia Hou and give her the archived evidence for interrogation.

2. Secondly, classify all the clues and infer that Richard is the only one with motive.

3. Finally find Patricia, get a part of the model and enter the library. After entering the library, you can find the way to enter the guest room.