Twelve Angry Men takes place in a jury room in the late afternoon on a hot summer's day in New York City. After the curtain rises, the judge's voice is heard offstage, giving instructions to the jury. He says that the defendant is being tried for first-degree murder, which carries a mandatory death penalty. The judge adds that if the jury has reasonable doubt about the guilt of the accused, they must acquit him. The verdict must be unanimous.
The jurors, all men, file into the jury room and sit in straight-backed chairs around a long conference table. The weather is hot, and there is no air-conditioning; some of the men are irritable. From the initial chitchat, it is clear that most members of the jury regard the man as guilty. Jurors Seven and Ten ridicule the defendant's story. Apparently, a young man has stabbed his father to death with a knife. He admits that he bought a knife that night but claims that he lost it.
The jury takes a vote. Eleven jurors vote guilty, and one juror, Juror Eight, votes not guilty. Jurors Three, Seven, and Twelve criticize him, but Juror Eight says that he does not know whether the man is guilty or not but that it is not easy for him to send a boy to his death without discussing it first. After some argument, they agree to discuss the facts of the case. Juror Three reviews what they know. An old man who lives underneath the room where the murder took place heard loud noises just after midnight. He heard the son yell at the father that he was going to kill him. Then he heard a body falling and moments later, saw the boy running out of the house. Juror Four says the boy's story is flimsy. He said that he was at the movies at the time of the murder, but no one remembers seeing him there. Also, a woman living opposite looked out of her window and saw the murder through the windows of a passing elevated train. During the trial, it was verified that this was possible. Further facts emerge: the father regularly beat his son, and the son had been arrested for car theft, mugging, and knife fighting. He had been sent to reform school for knifing someone.
Juror Eight insists that, during the trial, too many questions were left unasked. He asks for the murder weapon to be brought in and says that it is possible that someone else stabbed the boy's father with a similar knife. Several jurors insist the knife is a very unusual one, but then Juror Eight produces from his pocket a switchblade that is exactly the same. He says that it is possible the boy is telling the truth. The other jurors scoff at this, but Juror Eight calls for another vote, a secret one this time. He says that he will abstain. When the votes are counted, there are ten guilty votes and one not guilty.
Juror Three is angry with Juror Five because he thinks that Juror Five is the one who changed his vote. It transpires that the not-guilty vote was cast by Juror Nine. This juror says that he wants to hear more discussion of the case, even though there is still a strong feeling among the other jurors that the defendant is guilty. Jurors Three and Twelve start to play a game of tic-tac-toe to pass the time, but Juror Eight angrily snatches the piece of paper away, saying that jury deliberations are not a game. Pressured by Juror Eight, the jury agrees that it would take about ten seconds for the train to pass by the apartment. Juror...
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