Based on

Movies like Čtyři v kruhu (1968)

This drama with a criminal plot is a study of the intricately intertwined relationships of four people whose lives have been interrupted by the violent death of a loved one. The story begins almost classically: when a visitor rings the doorbell of a prominent scientist's villa, there is an explosion. The owner is found poisoned by gas in the demolished room. Everything suggests that he committed suicide. But then a major twist comes and the seemingly obvious suicide becomes a well thought out and carefully prepared crime...