In a Warsaw apartment, a woman wakes at night to find her husband's dead body. Hysterical, she runs to her neighbor, who asks her partner for help.

Aleksandra Światło, aka "Białko," changes her surname to Lach. She takes tests to show her weapon-handling skills, intelligence and amazing reflexes.

The department director orders Białko to arrest an MP associated with the coal mafia. During the raid on her apartment, the woman commits suicide.

A weakened Bońka in disguise knocks on a "Mountaineer's" window and asks him for help. On entering the premises, Bońka kills him and feigns a suicide.