The young and inexperienced investigator Masha Provorova was offended - no one takes her seriously! So with the case of the disappearance of Larisa, the wife of lawyer Ignat Grishin, nothing works out for her. Larisa found letters at home from her father, whom she had never seen, went to look for him and disappeared, getting off the train at a remote stop. Everyone assured Masha that her wife had simply run away with her lover, but something haunted her. She was especially wary when the body of a young woman with an expensive antique ring on her finger was discovered in an unmarked grave...