London, 1665. A serial stalks his prey, scalpel in hand and vengeance in his heart. Five years after his restoration to the throne, Charles II leads his citizens by example in enjoying every excess. Londoners have slipped the shackles of puritanism. Murder victims begin to pile in the streets, making no distinction between a royalist member of parliament or a Cheapside whore. The victims have one thing in common, they have been found with gemstones in their mouths, and they have not just been murdered, they've been sacrificed. Now the plague is returning to the city with full force, and murder has found a new friend.