Kit (Doris Day), an American married to wealthy London businessman Tony Preston (Rex Harrison) becomes the terrified victim of a mysterious stalker, who she hears but can never see. She is threatened by the eerie, high-pitched voice as she walks in the thick London fog. She then begins receiving repeated threatening telephone calls. The now totally panicked Kit is nearly killed when someone pushes her in front of a bus. Unfortunately for Kit, no one but she hears the voice or the telephone calls and neither Tony, Kit's visiting aunt Bea (Myra Loy), or Scotland Yard take any of these incidents seriously. The only one who seems to believe Kit is Brian Younger (John Gavin), a construction foreman, but Kit is not convinced that she can trust him. The tension builds to a thrilling climax as Kit flees for her life on a scaffolding outside her apartment building. Midnight Lace is an exciting thriller, with many surprising plot twists and a nice sinister performance by Rex Harrison. Roddy McDowall is also fun as the son of Kit's housekeeper, who keeps hitting up his mom for money.