In Twelve Angry Men, justice is shown at the end of the story. The duty of a Jury (the title characters) is to determine whether there is proof beyond a reasonable doubt that the defendant committed a wrongful act. In the case ofTwelve Angry Men, a young man is accused of murder. The case as presented was quite solid; the defendant had recently bought a switchblade, the switchblade seller said it was "one-of-a-kind," an eyewitness saw the defendant stab the victim overhand, another witness saw the defendant flee the scene, the defendant does not have an alibi.
However, the jury finds some problems: one of the jurors owns a switch-blade identical to the murder weapon, the eye-witness who saw the crime was too far away to reliably identify the culprit, the other witness had credibility issues, and overhand stabbing is an extremely awkward and unorthodox method for a switchblade.
Ultimately the jury finds that there is reasonable doubt about the defendant committing this murder, and returns the only proper verdict in this case: 'Not Guilty.' Justice has been done.