A mansion in Beverly Hills is leased out to host an event wild enough to herald the end of days.

The next day there isn't a living soul to be seen. In the driveway sits a super-stretch limo, unlocked, with four bodies inside it. Nothing links the victims together. Each has been killed in a different way.

Now it's up to brilliant psychologist Alex Delware and LAPD Lieutenant Milo Sturgis to begin their grisliest and most baffling case yet.

As they struggle to make sense of the mass slaying, they will be forced to confront a level of evil that nothing can prepare them for.