The first floor of the building consists of a hallway and one poorly-lit room, and it contains many valuables that Corvo can sell for coin.
On the second floor is a personal lounge for Pratchett with his chair in front of the fireplace. Here, Corvo can find a book and some elixir, as well as a few sellable items.
The third floor is Pratchett's bedroom. It is here that Corvo can find the source of a humming sound that can be heard from the second floor: a locked safe. Using a note found on this floor, Corvo can figure out the combination for the safe, which is hidden in a series of paintings throughout the house. Inside the safe is a rune and two gold ingots.