There are 13 diary pages scattered throughout the mansion. These are crucial for understanding the lore and unlocking the "100% completion" or Platinum trophy.
Use your flashlight to navigate dark corridors, but remember to look for the Monocle early on; it reveals hidden paths, such as ladders or markings, that are invisible to the naked eye. Key Story Items & Puzzles
A girl will point you toward a closet; hide there immediately.