Cry Wolf

Eight unsuspecting high school seniors at a posh boarding school, who delight themselves on playing games of lies, come face-to-face with terror and learn that nobody believes a liar - even when they're telling the truth.
After a local woman is murdered, a group of teenage liars create a warning e-mail of a serial killer named “The Wolf”, coming on the next full moon. The teens describe each death method The Wolf uses, but when the described victims actually do start turning up dead, suddenly no one knows where the lies end and the truth begins.