Sergei turned to Agatha, the best private detective in the city, at the request of his girlfriend Nastya. Nastya works at a bank and suspects that something fishy has been going on there lately. Her boss Inga recently died of a stroke, and it looked very suspicious, but the police did not find any crime in her death. Now Nastya is very worried, she fears for her life. And, as subsequent events show, her suspicions turn out to be not at all groundless...