Murder in the Crooked House

The crooked house sits on a snowbound cliff at the remote northern tip of Japan. A curious place to build a house, but even more curious is the house itself - a maze of sloping floors and strange staircases, full of bloodcurdling masks and uncanny dolls. When a guest is found murdered in seemingly impossible circumstances, the police are called. But they are unable to solve the puzzle, and more bizarre deaths follow. Enter Kiyoshi Nitarai, the renowned sleuth. Surely if anyone can crack these cryptic murders it is him. But you have all the clues too - can you solve the mystery of the murders in the crooked house first?