The completely natural desire of private detective Tatyana Ivanova to spend a week on an uninhabited Volga island led to one of the most dizzying and dangerous investigations in her practice. The shooting of bandits, of which she was an involuntary witness, was just a link in a bloody chain of crimes. But Tatyana could not even imagine that in the fight against bandits her ally would become not only an FSB agent, but also... a merciless killer.