During your stay in Uncle Monty's house, you need to get fresh water for his fish. You get the water from Gustav's room. While there, climb to the top platform on the right side and shoot the snake eye carved into a wall with apple cores from Violet. Vines will drop down. Climb down the vine. On the other side of the room, a vine will appear. Climb up, then hit the other snake eye. A platform will appear, and take you around the top of the room, where whole lockets (for health) and photographs will appear.