Brian Gruber's life takes a horrifying turn when his stepfather brings home an unusual mirror from a yard sale. Brian discovers the flipside of teenage angst as a struggle to survive takes on a whole new deadly meaning. He, and his best friend Stacy, bound together since childhood, face circumstances and horrors from Beyond and from the most innocuous ring of the doorbell.

In order to defeat the mirror they have to find out what it is and conquer their own inner demons. That takes time.

Time they don't have.