Eleven-year-old Henry stumbles through a portal onto the estate of the sinister Mr. Mason. Henry quickly discovers he's not the only one trapped at Verdant Corner by Mason's dark sorcery. He and the other boys must compete in weekly games where losing means death.Henry must enlist allies from unlikely places-a rogue deliveryman who is more than he seems, spectral figures from Henry's past, and creatures from the mysterious Yonder-in his desperate rebellion against the evil threatening him and his friends.Can Henry learn the truth about Mr. Mason's powers? And will that knowledge be enough to survive?