Year 1944. According to information received from a recruited German agent, the Nazis are planning a major act of sabotage in one of the Arctic ports through which the Soviet Union is supplied with food, goods and material of vital importance from the Allies under the Lend-Lease programme. Heroes Yelena Soley and Sergey Saburov, from the "The Black Sea" series, will have to disrupt the enemy operation and save the port from impending disaster