Sofya Pavlovna is an extraordinary and active person. Disappointed in her next husband and boring job, she fulfills her long-standing desire and opens the “Detective Agency of Damochkina S.P.”, to which the jokers of their small provincial town immediately gave the name “Lady with a Gun”. Her first client is policeman Yuri Sviridov, who is accused of murdering a young woman. During a complicated investigation, Sophia meets him - the man of her dreams, the one and only!.. And how now to get out of the circle of the doomed in which they both found themselves? After all, her beloved is on the list of suspects! The only way out is to find the true killer.