An 18-year-old boy who grew up in the slums was brought to court for allegedly killing his father. The witnesses were very convincing and all the evidence was extremely unfavorable to him. Twelve people from different professions formed the jury for this case. They had to reach a unanimous opinion in the lounge to decide whether the boy was guilty. If convicted, the boy would be sentenced to death. The twelve jury members were different. Except for Juror No. 8 (Henry Fonda), the others were dismissive of this case with such clear facts of the crime and determined that the boy was guilty before the discussion began. Juror No. 8 raised his own "reasonable doubts" and patiently persuaded the other jurors. In the process, each of their different outlooks on life were also in conflict and contest...