Engineer Jan Taraba is arrested for the murder of an unknown man whose head he crushed with a bottle in a wine bar. Inspector Šimek, who examines Taraba, tries to find the motive for the act, especially because the culprit was sober when committing the crime and is moveover unaware of the victim's identity. In his testimony, the unfortunate culprit Taraba recalls the tragic event of three weeks ago. Coming back home at night with his wife, they both notice a drunk man unable to pick up his car keys from the ground. Mr Taraba hands the keys to him. The man starts his car up and sets off like a shot. Drunk, he drives the wrong way, hits Mrs Tarabová on the pavement and drives off. The young woman dies in the hospital. The examination fails since the shocked Taraba cannot recall neither the type of car nor the man's appearance. In despair, he begans to frequent night bars and wastes his time, watching the boozers and hang-abouts with reluctance. One night, however, this helps him to discover the drunk who removes not only some banknotes but also car-keys from his pocket. Taraba recognizes the keys. The murderer of his wife moreover keeps muttering about the need to enjoy life at any costs. Taraba fails to control himself and revenges his wife's death.
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