A married couple decides to sell an abandoned basement in their own house. The common man, Mr. Fonzich, shows up to buy it. So far, nothing unusual, but the man moves into the basement and makes it his permanent residence. The couple are desperate to cancel the sale, but to no avail. Things get even more complicated when the man befriends his teenage daughter, whom he seems to have a terrible influence over, becoming a threat to his family. Holocaust denier.