“Two thirds of a ghost” is an old salon game: the participant who doesn’t answer the next question loses one third of their right to continue the game. If you don’t answer three questions, you’re eliminated. You become a ghost. An innocent game will become the last event in the life of one of the participants. Having drunk potassium cyanide, he goes from an imaginary ghost to a real eliminated player. The first steps of the investigation lead to new mysteries—who was the person who died in life? His identity is as ghostly as the failed game.2