The Vampires

William and Michael, with the assistance of Daniel and Charles, all aka The Vampires, are the main antagonists appearing in the Alex Cross novel Violets Are Blue. The duo are two brothers with an obsession with cannibalism laying waste to multiple people to feed on their corpses, Daniel and Charles two travelling magicians conspiring with them and making up the rest of the cult.

Biography
The brothers would butcher and flay people to consume them after, watching the news reports to stay one step ahead and even breaking into morgues to feast on dead people there. The Mastermind had been killing in coincidence with them along with other criminals Alex Cross was chasing, so after differentiating a tiger mauling that was Kyle Craig's doing, the brothers were tracked when they were found to have held victims captive and bitten them. A woman who escaped the brothers in California proved crucial in tracked the duo down.