A trio of bounty hunters, known as Killjoys, chase deadly warrants through the Quad, a distant area that is near the start of a violent class war among multiple planets. Gorgeous but deadly Dutch is a top-level Killjoy who has a unique gift for earning people's trust, regardless of their class. The much-loved Killjoy harbours a dark secret. Kindhearted John is a peacemaker who prefers not to fight. Handsome, loyal former soldier D'avin is experienced in hand-to-hand combat, which makes him a valuable asset to the team.