No one turned to private detective Tatyana Ivanova with a request to understand the mysterious suicide of the reckless and attractive Irina Leikina. Having started, on her own initiative, an investigation into the death of her college friend, Tatyana did not know what awaited her ahead. She is attacked by unknown assailants and beaten until she loses consciousness. Waking up after one of these attacks on a boat speeding across the endless expanses of the Volga, Tatyana becomes firmly convinced of the idea - at all costs, to complete the matter and find out who is behind all these crimes...