On board a Soviet liner, customs officials found an abandoned travel bag. Inside they discovered platinum discs used for the contacts of high precision devices. Each of them was hidden in a chocolate. However, at the factory of high-precision devices where these types of parts are made, a woman was killed who was involved in stories of theft. The police are on the trail of smugglers. The investigation into this murder is entrusted to a young policeman, Zvonarev, who goes up the chain and discovers how from the Soviet factory the smugglers steal coins containing platinum, this precious metal, and through a agent, tries to get him abroad by the liner "Alexander Griboyedov". To leave no trace, the criminal seeks to assassinate the witness ...
