The investigator must be honest and impartial; feelings only interfere with the case. Borin adhered to this simple rule all his life. But even an old woman can get screwed. A cynical and experienced investigator fell in love as a boy with one of the witnesses in a double murder case. Or not just a witness? And the matter turns out to be difficult. A ruby set, bequeathed to the descendants of the five Pechenkin sisters, is the key to obtaining considerable valuables lying in a Swiss bank. Almost a century later, one of the heirs, Leon, who is heavily in debt to a local authority, finds an old will and begins searching for relatives in the hope of collecting all the items together and receive an inheritance. And then the murder of one of the heirs and the loss of earrings from the set...