Private detective Tatyana Ivanova was approached by her friend Lena with a rather unusual request: to go to a free psychological training “Secrets of a Happy Marriage.” Tanya was not at all eager to join the ranks of the “weds,” and Mendelssohn’s march sounded absolutely not for her, but how to refuse a beloved friend who really wanted to get married. No one suspected that the famous and well-known psychologist Listopadov, who was supposed to conduct the training, would be involved in a criminal case about the murder of the young and attractive Elizaveta Gorodnichenkova, which Tatyana Ivanova was involved in...