Private detective Igor is investigating the murder of lawyer Krutkov. The corpse of a lawyer with a knife in his heart was found in his own house, where the day before a group of lovely people were walking with the owner: a young man Artem with his girlfriend Angelina, spouses Anna and Oleg Nalyotov, as well as a successful businessman Peter and his mistress Sofia... Everyone had an alibi . But under the nails of the murdered lawyer, blood belonging to Artyom was found. However, the detective considered this evidence unconvincing and focused his attention on the person who was least likely to be suspected...