Summer, 1940. Foreseeing the collapse of the Ulmanis regime, the owner of a ship sailing off the coast of Latvia decides to flee the country. Subsequently, the sailors learn about the establishment of Soviet power in their homeland, and the ship changes course...

In the experimental clinic, a batch of valuable drug was stolen. Major Grigast suspects that someone from the clinic is involved in this. He entrusts this complex matter to a young investigator Mara. An investigation leads her to a distant border town in the south of the country, where the offender intended to ship the drug abroad.