Stanley's killer didn't enter his room through the guestroom door.
Only Alfred's "dark room" mystery involved secret passages.
The only way for a murderer to exit Stanley's guestroom is by passing through the main door.
These truths means that Stanley's killer must have entered through the window, and left through the door
We know from this truth (and the story):Stanley couldn't invite anyone, because he was not able to open his own room from the inside. that the door cannot be opened from the inside. (that would be nice to get a red truth on clarifying)
Natalie didn't let any killers in or out of Stanley's room before you found him.
Stanley's killer didn't lock the guestroom doors from the outside between Stanley being killed and you seeing Stanley's body.
These truths means that someone else must have helped the killer to get out from the room[/b][/color]
We also know that When you and lady Natalie entered Stanley's guestroom, noone was hiding inside.
With these, can you give us the red truth: Someone that is not Natalie or Stanley's killer opened Stanley's guestroom door to help Stanley's killer get out during the night. ?
Or similar.