Returning from a late night run to the drugstore, Jervis Tidmouth witnesses a strangely disfigured man enter a neighboring apartment. Unsettled by the grotesqueness of the man's appearance and certain that a young woman lives in the apartment alone, he cannot rid himself of the thought that something may be amiss.
Increasingly convinced by discoveries made during the night, Tidmouth roils in indecision and fear, inching toward a confrontation as much with his own manifesting paranoia as with whatever truth he might uncover.