The assistants of Polina Kazakova, known in the city as Miss Robin Hood, Lyusya and Vasya, having met a lonely strange girl in the cemetery, at first mistook her for a crazy person. Polina meets a lady: her name is Martha Marsvin, she is a Danish citizen and came to the funeral of her Russian grandfather Matvey Lepnin. However, the urgent telegram with which Martha was summoned was a week late. This worries Polina. However, like the death of Matvey, an elderly but physically strong man. Soon, from Lepnin's diary, Marta learns that she is a hereditary noblewoman and is the heiress of a huge fortune. Polina understands: where big money is involved, there can be no question of accidents or coincidences, and takes the situation into her own hands...