Ellen Hardy, working as a live-in assistant to wealthy widow Mrs. Armstrong, gets a call from the mental institution where her younger brother George and sister Mandy have been living since they were accused of killing their parents when they were six and four years old. George is turning 18, and rather than send him and Mandy to an adult facility, Ellen takes them back to live with her in Mrs. Armstrong's large house. Afraid of what their reception would be if the others knew the truth, Ellen conceals their dangerous history.

Upon arriving at the house, Mandy insists that she and George have a designated "mad room," a place where they can go to be alone when they are frustrated. Ellen reluctantly agrees to give them access to the former Mr. Armstrong's study despite the fact that Mrs. Armstrong refuses to let anyone in it. One night Mrs. Armstrong discovers Mandy in the study, and confronts Ellen about her mounting suspicion that they are keeping something from her. While Mandy and George eavesdrop from outside the room, Ellen finally breaks down under her questioning and tells Mrs. Armstrong about their grim childhood and the suspicion that either George, Mandy, or the both of them had killed their parents with a butcher knife. Mrs. Armstrong explains to Ellen that she can't keep the children at the house anymore, and goes to bed frightened.

The following morning, Ellen screams when she discovers Mrs. Armstrong dead in the "mad room," slashed by a saber. Mandy and George run to the scene, and both scream in horror and accuse each other of being the murderer. Ellen quickly turns into action, and to cover-up the crime, insists that they tell the rest of the staff that Mrs. Armstrong has gone away on business unexpectedly. After another incident at the house, George and Mandy begin to find Ellen's ability to lie unsettling and suspect her of killing Mrs. Armstrong as well as their parents.

Ellen's nerves begin to fray, and tries to convince her fiancé Sam, the stepson of Mrs. Armstrong, that they should send the children away. She finally snaps after seeing that the family dog has discovered the dismembered body of Mrs. Armstrong and has brought a single hand out into the yard. She kills the dog and in the final scene is discovered by Sam, kneeling in the basement by the furnace as she once did the night she murdered her parents.

• Stella Stevens as Ellen Hardy
• Shelley Winters as Mrs. Armstrong
• Skip Ward as Sam Aller
• Carole Cole as Chris
• Severn Darden as Nate
• Beverly Garland as Mrs. Racine
• Michael Burns as George Hardy
• Barbara Sammeth as Mandy Hardy
• Lloyd Haynes as Dr. Marion Kincaid
• Jennifer Bishop as Mrs. Ericson
• Gloria Manon as Edna
• Lou Kane as Armand Racine

Home media edit

The Mad Room was released for the first time on DVD by SPHE on March 4, 2011.^[5]

Critical response for The Mad Room has been mixed to negative.

Variety noted the acting, and scenery as being the better part of the film, but criticized the film's weak story, predictable plot twist, and tendency towards melodrama.^[6] Time Out called the film "disastrously renovated for contemporary consumption", and noted the film as being routine.^[7]

Alternately, Howard Thompson of The New York Times gave the film a positive review. Thompson praised the film for its acting, direction, tension, and cinematography; calling it "a fine suspense-shocker"^[8] Paul Mavis from DVD Talk awarded the film 3.5 out of 5 stars, writing "Not "horrific" by today's standards, but acceptably frightening and strange, with some nice direction and strong performances by the cast, particularly the underrated Stella Stevens. Fans of the two stars, and appreciators of the genre from this time period, will certainly enjoy this."^[9]

• The Mad Room at the American Film Institute Catalog
• The Mad Room at AllMovie
• The Mad Room at IMDb  
• The Mad Room at Rotten Tomatoes
• The Mad Room at the TCM Movie Database