Joel Demetrius is looking forward to moving in with his new stepfamily, but as far as his sister Cassie’s concerned, they’re nothing but intruders. Cassie doesn’t want anything to do with their mother’s fiancé and his two sons, and to make matters worse their new home is a rotting old heap, neglected for decades. Joel thinks it’s interesting; Cassie thinks it’s a dump. But as fascinated as he is by the place, Joel has to admit there’s something not quite right about it. Not only does he keep seeing things out of the corner of his eye, but strangely realistic nightmares are keeping him awake. And now day is becoming just as horrifying as night. Joel’s nightmares are developing into blood-drenched hallucinations and the others are starting to feel the same strange presence from his dreams. As the events in the house gradually become harder to explain, the line between nightmare and reality is beginning to blur—and now all four teenagers are starting to wonder just who the intruders really are.