When Jamie and Kirsty move into their first home together, they are full of optimism. The other residents of their building seem friendly too, including the Newtons, a married couple who welcome them to the building with open arms. But then strange things start to happen. Dead rats are left on their doorstep. They hear disturbing noises, and much worse, in the night. After Jamie's best friend is injured in a horrific accident, Jamie and Kirsty find themselves targeted by a campaign of terror. As they are driven to the edge of despair, Jamie vows to fight back-- but he has no idea what he is really up against.