In a small town where everyone knows each other, a guy and a girl, high school students, die under unclear circumstances. Fifteen years have passed, but that tragedy still haunts detective Nap Dumas. He cannot accept any of the versions of the investigation; he does not have a complete picture of those days when his life turned around in such a fatal way. After all, then he lost not only his twin brother - exactly on the same day his beloved girl unexpectedly disappeared, and attempts to find her led nowhere. But suddenly, after so many years, her fingerprints come up in the case of the murder of a policeman, by a strange coincidence - once their common classmate. And in an old school album, a certain clue is discovered that could lead to further deaths... For the first time in Russian!