If you hear them coming, you're already dead.

As a young novelist and his wife are coping with the loss of their child, their lives are turned upside down when a panicked girl appears at their home in the middle of the night with stories of masked intruders stalking her. That night, the stalkers strike, sending the couple on a horrific game of cat and mouse, where they are forced to uncover shocking details from their past that may be the reason for the attack.