11-year-old Forrest lives at the Tower of London prison, where his father tends the Tower ravens and guards inmates. Forrest's only friends are his pet raven, his father's prisoners (who all end up dead), and Ned, the young rat catcher. Soon Forrest's father gets a new prisoner: Maddie, the beautiful daughter of a Scottish spy. Immediately Forrest and Maddie become friends. But when she is slated for execution, Forrest must make some painful choices: Should he commit treason to help her escape, or obey the law and let his innocent friend be hung?