The Kult (2012)

People are predictable. That's what makes them easy to kill. Acting out of misguided loyalty to his friends, police officer Prosper Snow is goaded into helping them perform a copycat killing, but when the real killer comes after him, it's not only his life on the line, but his family's too. Now if he goes to his colleagues for help, he risks being arrested for murder. If he doesn't, he risks being killed.