In a small town where everyone knows each other, under unclear circumstances, a guy and a girl, students of the graduating class, die. Fifteen years have passed, but that tragedy haunts detective Nap Dumas. He cannot accept any of the versions of the investigation, he does not have a holistic picture of those days when his life turned so fatefully. After all, then he lost not only his bra-ta-twin - exactly on the same day his beloved girl suddenly disappeared, and attempts to find her did not lead to anything. But suddenly, after so many years, her fingerprints pop up in the case of the murder of a policeman, by a strange coincidence - once their common classmate. And in the old school album there is a certain clue that can lead to more deaths...