Harry goes to see where his mother lived as a child. He gets drunk and ends up in a tree that Snape and Lily used to go to. A ward tells Snape someone is there, and he finds Harry. Harry ends up staying at Snape's. Harry gets sick due to an infection in his back, and Snape has to lance open the welts and bandage them and pack them. He also tries to run away to Grimmauld Place.
During his stay, Harry accidentally breaks a glass, cutting open his hand. The bedrooms are hidden by a bookshelf.