Bring Me the Head of Prince Charming

Bring Me the Head of Prince Charming is a fantasy novel by Roger Zelazny and Robert Sheckley.

Introduction

Every millennium, a large contest is waged between the forces of good, and the forces of evil, which determines events during the following millennium. On the side of evil, there is the demon and master of sabotage, Azzie Elbub; on the side of good, there is the angel Babriel. Both entities must abide by the rules and customs set by their own sects.
The contest is a trial of human nature and takes the form of a fairy tale involving two humans—a prince and a princess. Their choices will determine the winner.