The quiet evening of two married couples has ended. The guests went home. Nothing foreshadowed the tragedy, it would seem. But two of them have their own history and their own secret. They once dated and broke up, thinking that it would be better for everyone. Did not work out. For three years, neglecting the principles of friendship and family fidelity, they betray their lawful... And so, the next evening, each returning to their home after a date, they find their spouses shot dead... Realizing that suspicion of murder will first of all fall on them, they flee from the city... But the investigation encountered an interesting circumstance - the killers left their prints in both apartments... they drank wine with the murdered... And whose prints are these...