The corpse of Vadim Ostroglazov, a relative of the owner of the estate Evgeny Kostin, was found in the estate pond. On the eve of the murder, there was a picnic at the estate, and guests invited by the owner walked noisily. The nicest people had known each other for a long time, and, at first glance, none of them could have committed murder. Lieutenant Colonel Stepan Krucha went to the crime scene. The questioning of witnesses did not produce any results, and then the detective began interviewing the guests present at the picnic. And then it turned out that absolutely everyone was under suspicion...