What lurks downstairs? While painting his new house, Aaron discovers a hidden door to a cellar that he didn't know existed. How could everyone, including the agent and the seller, overlook it while closing on the house? Aaron opens the door and nothing but blackness is waiting for him... Later, his wife discovers that something is missing from the house and something of unusual value has been left in its place as a sort of blind trade. But why? Who has been in the house? What are they going to take next?