Pravda leytenanta Klimova (aka...Lieutenant Klimov's Truth) is about a Navy Lieutenant Klimov (Rostotsky) who is in charge of the nuclear missiles on his submarine. He is also married to the most beautiful lady (Kondulainen) and his career looks good, considering he was a boy from Leningrad. But after returning home from a training trip he discovers about his wife infidelity with another Navy officer. Angry Lieutenant Klimov hits the cheating guy smack in the face with his heavy fist in front of public. Then comes the severe punishment of demoting and moving Klimov to the rough service at the Polar Ocean. This becomes a great challenge in Klimov's life. But with the help of an experienced and caring senior officer, Klimov proves that he is an outstanding professional and a reliable friend that is very essential on the boat.