Fourteen-year-old Jason Shepard (Muniz) has always been known for exaggerating facts.However, when Hollywood big-name producer Marty Wolf (Paul Giamatti) steals his class composition and adapts it into a sensational popular movie, no one believes what Jason says this time - this accusation, seen as "another lie", is nothing more than a replay of his old routine in the eyes of everyone. In order to clear the grievances and give yourself justice, Jason and his most trusted friend Kelly (played by Bynes) embark on an adventure across the United States.They carefully planned a set of high-tech means to vow to force the truth out of the cunning Wolf and let the world see the true face of things.In this battle between true and falsehood, the two teenagers not only have to face the many obstacles of reality, but also find the power to grow in friendship and belief.