Marusia Burova, a young girl from the northern Russian town, smart, beautiful, race car driver, is going through hard times. Maroussia has just buried her mother, who raised her alone. Mom’s brother, Uncle Vitya, persuades her to move to him in Moscow. Among the papers of his mother, Marusya finds unsent letters to her only lover, Marusin’s father. Maroussia decides to find her father. Three candidates are suitable for romantic descriptions from old letters at once - “three musketeers”, friends from youth, now connected with difficult business relationships. Continuing the search, Maroussia finds herself in the center of an intricate intrigue that could destroy the old friendship of the “musketeers”, and possibly seriously threaten the life of one of them.