Penn and Chandelle only wanted to rent a house in Philadelphia in order to have their granddaughter, Llynn, stay with them for the summer.

The rent-free house they find seems to be perfect -- it's fully furnished, sporting equipment, a refrigerator fully stocked, TV, stereo, a dynamite, ahead-of-state-of-the-art computer system, and technology they've never seen before.

Each new day they begin to uncover more and more unexplainable facets of the house, until they have to ask themselves: What does this house want of them? Why were they, specifically, asked to stay rent-free for a month? Should they leave it? Can they leave it?