Maciek is a young Resistance fighter who is ordered to kill Szczuka, a Communist district leader, on the last day of World War II. The Soviet leader who has arrived in town to establish a new government. A mistake leads him to a beautiful barmaid who shows him what his life could be like and although killing has been easy for him in the past, Szczuka was a fellow soldier, and Maciek must decide whether to follow his orders.

In this comedy set in German-occupied Poland during World War II, Elzbieta Czyzewska plays Maria, a fearless Polish girl who unwillingly brings an Italian soldier and deserter of the Eastern front into her Warsaw apartment. The "guest" becomes trouble for Maria, as she is involved in a conspiracy and lives with her brother, an artist (played by Zbigniew Cybulski). Circumstance involves the Italian with the Polish underground, and of course he falls in love with the beautiful Maria.