On a cold winter evening, an influential businessman and his girlfriend entered the elevator. A man in a black mask was waiting for them on the landing. He shot the millionaire three times, but for some reason did not touch the beauty, leaving an important witness alive. The circle of suspects is wide, the death of the businessman plays into the hands of many. An “inconsolable” widow who recently learned about an impending divorce, a nimble assistant who is famously running financial scams without the boss’s knowledge. Even the businessman's mistress and the Minister of Health are under suspicion! The complicated case is reminiscent of a complex chess game, but in life people do not play by the rules...