The Danish film Knight of Justice, directed by Anders Thomas Jensen and starring Max Mikkelsen, Nikolai Ray Cass, Roland Möller, Gustav Linde, etc., staged a play in which an accident led to murder.
Math geek Otto is very good at reasoning, he and his partner Leonard pull investment together, but because of some accidental factor in reasoning, he fails. When he took the train home, he gave way to a woman and a girl, and just after giving up his seat, there was an accident on the train. Otto awoke from his coma to find that the woman was dead and the girl had survived. It turned out that the woman's husband was the wife of Marcus, a soldier serving in the army, and the girl was Marcus's daughter Marty Erde.
Otto repeatedly watched the train accident video and found some clues. He told the police that on the eve of the train accident, a man threw away the sandwich and juice he had just bought and got out of the car, which made Otto think that he had found the key point to solve the case, and that there were key witnesses on the car to correct the criminal group leader "Eagle" incriminating evidence, who was killed in the car accident, and Otto judged that the train accident was a naked murder. The police ignored his reasoning, and he and his partner Leonard approached Marcus and spoke his mind. Marcus, who is in grief, is looking for revenge, and the two sides hit it off.
Otto and Leonard find the computer genius Emman Seth and ask him to help find the suspect who got out of the car halfway through. Through the face comparison of computer big data, they found the person, who turned out to be an electrical engineer of a train named Paz Oleson. When they find Pars Oleson, they are threatened with a pistol, and Marcus, enraged, turns around and kills Paz Oleson. Leonard cleans up the scene and saves the male pet who is being toyed with by Paz Oleson.
Through face-to-face comparison, they discover that Paz Oleson is actually the younger brother of the head of the criminal group, "Eagle", who begins to investigate the matter and takes revenge with the gang. The Eagle leads the men to track Marcus and his party, shooting them, but Marcus fights back and is beaten to pieces.
Things get out of hand, and the Eagle takes people to Marcus's house, engages in a shootout, and threatens Marcus's daughter and her boyfriend as hostages. When Marcus surrendered his gun, Otto, Leonard, and others raised their guns and swept through the crime syndicate.
In the end, they didn't figure out whether the train accident was murder or not. Their conclusion that Paz Oleson is the younger brother of the "Eagle" was overturned through face comparison, and the real "Eagle" brother was abroad and had not yet returned home. But it doesn't matter anymore. They won the war with the criminals, but everything seemed to be caused by accidental murders, train accidents, and Marcus's killing of the criminal group may have originated from Otto and Leonard's inference, which is the most unreliable.
Think about it.