Thirteen-year-old Theodore Boone dreams of being a lawyer, or maybe even a judge, someday. He spends his free time at the courthouse and knows all of the clerks, policemen, and judges, and they know him. He even gives legal advice to his friends and schoolmates. The most sensational murder trial to ever hit his small town is just about to start, and Theo hopes to have a front row seat. But suddenly, he finds himself dragged into the middle of the trial -- the killer is about to go free, and only Theo knows the truth that can put him behind bars. How can he make sure that justice is served, without putting himself and his family in grave danger?