England, 1605. Twelve-year-old Tom must save his father from being hanged. He falls in with a mysterious stranger, the Falcon, who promises to help him in exchange for his service. But on the long journey to London, Tom discovers the Falcon's true mission - a plot to blow up King and Parliament with barrels of black powder! Now Tom faces a terrible decision: secure his father's release, or stop the assassination of the King . . .