Three hundred years ago, fate bound Prosper Redding and Prince Alastor of the Third Realm together. Now the human boy and fiend heir to the demon kingdom must put aside a centuries-old blood feud to save everything they love. Alastor will guide Prosper through the demon realm-under one huge condition: Prosper must enter into a contract with the malefactor residing in him, promising eternal servitude in the afterlife. With Prosper's sister in the clutches...