It is 1945, and the Russian occupation of Poland has been complete for some time. Kwiatowski, a surgeon, has been given a vacation by one of his grateful patients, a colonel in the (communist) Polish security force, known as the UB. While he is on leave, he takes an old girlfriend on a date at a fancy hotel. When some Russian Soviet officers give him some trouble, he unthinkingly adopts the guise of his patient, the security officer. This deception proves so successful that he finds it useful for any number of purposes, and he begins freeing people from prison and helping all sorts of people who have run into difficulty in the new regime. A highlight of this Polish language film is the satiric use by the main character of Communist Party lingo, as he skillfully turns its intended meanings inside out to manipulate the unwitting Party faithful.