there is a $1,000,000 contract on a Las Vegas Performers head, and his heart.
Whoever kills him and tears out his heart and sends it to mobsters, gets the cash.
But he is about to enter the witness protection program, so the FBI, has to hunt him down to save him, while 4 or 5 "hitmen" groups come to kill him.
99% of all of the cross fighting between these rival hitmen gangs happens within 4 or 5 different floors in a Nevada casino/hotel.
Cast includes:
Ray Liotta
Jason Bateman
Jeremy Piven
Ben Affleck
Ryan Renolds
Alica Keys
etc
etc