Ellen Hardy gets a rude awakening when she discovers that her brother and sister are scheduled to leave their mental institution. As children, they were put there after killing their parents. Ellen, who now lives in the house of an old widow, Mrs. Armstrong, takes them in. But if their secret gets out, it could jeopardize Ellen's plans to wed Mrs. Armstrong's stepson. She struggles with anxiety -- until Mrs. Armstrong suddenly turns up dead.
Unfortunately the movie The Mad Room is not yet available on HBO Max.
| Writing | A.Z. Martin | Writer |
| Writing | Bernard Girard | Writer |
| Directing | Bernard Girard | Director |
| Writing | Reginald Denham | Writer |
| Art | Sydney Z. Litwack | Art Direction |
| Sound | Arthur Piantadosi | Sound |
| Costume & Make-Up | Moss Mabry | Costume Design |
| Art | Sidney Clifford | Set Decoration |
| Sound | Charles J. Rice | Sound Supervisor |
| Sound | Dave Grusin | Music |
| Writing | Garrett Fort | Writer |
| Editing | Pat Somerset | Editor |
| Sound | James Z. Flaster | Sound |
| Camera | Harry Stradling Jr. | Director of Photography |
| Directing | Rusty Meek | Assistant Director |
| Costume & Make-Up | Ben Lane | Makeup Supervisor |
| Costume & Make-Up | Virginia Jones | Hairstylist |
| Production | Norman Maurer | Producer |
| Writing | Reginald Denham | Theatre Play |
| Writing | Edward Percy | Theatre Play |
