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The film follows the story of Dana Martinová, a young woman whose life is cut short by Pavel Zach, a mentally unstable young man. After killing Dana in a fit of jealousy, Pavel's actions spiral further out of control, leading to more violence and chaos. The narrative unfolds as Lieutenant Zeman takes on his first case, attempting to unravel the mystery behind the double murder.

Featuring a cast that includes Eduard Cupák, Jaroslav Moučka, and Marie Málková, the film captures the tension and intrigue of a crime investigation. With its focus on psychological themes and the complexities of the human mind, this film appeals to fans of classic crime dramas. This story, rooted in the early 1970s, provides a unique glimpse into the genre during that era, showcasing the societal issues and personal struggles faced by its characters.