Each evening, four men – a doctor, a journalist, a professor and a merchant – meet up in a deserted bar to play cards. As they play, the bar’s owner, her downtrodden barman (nicknamed “le paltoquet”) and a strange woman in white watch from a distance. One night, the card game is disturbed when a police inspector suddenly appears and declares that a dead body has been found nearby. Certain that one of the four men is the murderer, the inspector starts his investigation. All the evidence suggests that the doctor did the deed, but we soon learn that nothing is quite what it seems…