A murder just happened and it seems the answer is simple on who and how did it. But a casual talk between suspect's mother and prosecutor sets a different point of view on a just opened case.
Two cash collectors are found burned with their car but the bag is missing. Two detectives - Aleksandr Sanin and Aleksey Tulyakov are investigating the crime.
Seventies. The cold war in the midst of the USSR and the West are fighting hard for secret information about each other. Soviet intelligence agencies want to save their couriers from too much attention of customs officers at the Leningrad airport. These couriers deliver to the USSR important documents obtained by our scouts in Western Europe
