"Two Thirds of the Ghost" is an old salon game where a participant who does not answer the next question loses a third of his right to continue playing. Not answering three questions - drops out of it. He becomes a ghost. An innocent game will be the last event in the life of one of the participants. Having drunk cyanide potassium, he becomes a real retired player from the ghost of the imaginary. The first steps of the investigation lead to new mysteries - who was the deceased in life? His personality is as shadowy as a bad game.