The ship's chief mate has been tasked with delivering a large consignment of drugs. On the way, for refueling, the ship enters a Soviet port. The chief is afraid that there may be complications during customs inspection. To avoid them, with the help of a large dose of drugs, he takes the captain out of negotiations, who refused to fulfill his demands. However, the inspector of the Soviet customs Yevgeny Stenko manages to find a secret cargo.
