When learning that his father has disinherited him in favor of his psychotic sister, Arran Bruce decides to return to his family home and kill her. After his arrival at Dunshiel House, the player takes control of Arran with the keyboard. In the first part of the game, it is necessary to explore the house and talk to everyone in it. The player can pick up two objects: a piece of evidence and a murder weapon. When this is done, it is time for the family dinner, after which the evidence can be planted in a room, and the murder itself has to be committed. The last part of the game is the interview with a police detective. Depending on the player's actions and conversations, a different person (or no one) will be blamed for the murder.