Who will help a charming woman who is threatened by her husband's mistress? Only private detectives Kuptsov and Petrukhin, whom their work has taught them to take seriously even such seemingly banal threats. And, as it turned out, not in vain: from words, the mistress moves on to action, committing an attempted murder. But how can we identify all the participants in the assassination attempt, since the clarification of relationships between women led to the creation of an entire criminal group?