Adam "Mruk" Niedzicki is a member of a gang from a juvenile detention center led by two educators: Jóźwiak and Andruszewski. During a robbery at a currency exchange office, the owner dies, and "Mruk" decides to withdraw. He receives news of his mother's death and is given three days' leave. He does not know that he will become involved in a murder.
In 1943, a drunk cook is mistaken for a secret agent and sent on a special mission from London to Nazi-occupied Poland.
Peter and Eliza are vacationing in the Mazury region. After an argument with her boyfriend, the girl leaves him and goes away. Meanwhile, Eliza's father Jul, a sculptor, organizes a reunion of former members of the student theater in which he performed years ago.
