An older couple, Penn and Chandelle, rents a house in the city at a bargain price, and discovers that its back door opens onto an endless forest that completely surrounds the house.  Now they know why others were scared off.  That’s only the beginning of the oddities about this particular piece of realty.  They decide to call in experts: their grandchildren, Lloyd and Llynn, who pitch in with a will, to try to discover what and why.  But it may be more of a challenge than they can handle.