Officer Chris McCullers was gravely injured in a shootout and now works on 911-dispatch. Resentful that her career has ended up here, Chris receives a call from a scared kid and dismisses it as a prank. The next day, she learns that the call was all too real: there's been a murder.

18-year-old Mark wakes up in a parallel world where no one knows who he is - not his family, friends or girlfriend - and discovers that he and all the people he loves will soon die a painful death.