Let the Games Begin. Niccolo Ammaniti

The world might be in the throes of a global recession but when an author on the brink of despair, an enigmatic musician, a supermodel and a Satanic sect meet with the cream of Italian high society at the home of a Roman property tycoon, the world outside the mansion's walls is soon forgotten. There's going to be one hell of a party. And you've got a VIP ticket.