Cyber ​​entrepreneur Maslowski is shot dead in his bungalow. "Zero Trust," the victim's business tenet. Dr. Viktoria Wex, the forensic scientist, prefers to rely on forensic methods instead of people. When she clearly identifies the pistol of her neighbour and friend Leon Pawlak as the murder weapon, Viktoria has no doubts about the shocking KTU result. Leon, who protests his innocence, is now caught up in a maelstrom of suspicions. Even his ex-wife, Commissioner Kowalska, is finding it increasingly difficult to have him investigated.