Elizabeth Carter (Anna Cropper) is a mild-mannered housewife in a lifeless relationship with her emotionally impotent husband Tom (John Carson), a train engineer. Their mundane existence is disrupted when a mysterious young man named Glen (Tim Curry) arrives at their doorstep, claiming to be the long-lost son Elizabeth had given up for adoption years earlier. As Glen digs his claws deeper and deeper into Elizabeth, secrets from her past are slowly unravelled with a mix of comedy, horror, and surrealism calibrated by Potter with perfect burrowing unease. Curry has rarely been as unhinged and manic, and Cooper matches him in her fearlessness, making for an unsettling family portrait complete with semi-erotic serenade from son to mother that will make you want to take a nice long shower afterward.