When a small group of good friends join together to take a "toughen-up" class from crusty ex-Marine Cap Montieth, they expect the final exam to consist of nothing more than a rousing paintball game. But things take a much more serious — and deadly turn — and the bullets are real as they become the target in a game where the hunters are suddenly the hunted. It's a thriller with more twists than an Agatha Christie mystery.