| Dorothy McGuire | ... | Helen Capel | |
| George Brent | ... | Professor Albert Warren | |
| Ethel Barrymore | ... | Mrs. Warren | |
| Kent Smith | ... | Dr. Brian Parry | |
| Rhonda Fleming | ... | Blanche | |
| Gordon Oliver | ... | Steve Warren | |
| Elsa Lanchester | ... | Mrs. Oates | |
| Sara Allgood | ... | Nurse Barker | |
| Rhys Williams | ... | Mr. Oates | |
| James Bell | ... | Constable | |
| rest of cast listed alphabetically: | |||
| Erville Alderson | ... | Dr. Harvey (uncredited) | |
| Ellen Corby | ... | Neighbour (uncredited) | |
| Myrna Dell | ... | Murder Victim (uncredited) | |
| George Holmes | ... | The Killer's 'Shadow' (uncredited) | |
| Stanley Price | ... | Starry-eyed Man (uncredited) | |
| Robert Siodmak | ... | The Killer's 'Eye' (uncredited) | |
| Richard Tyler | ... | Freddy (uncredited) | |
| Charles Wagenheim | ... | Desk Clerk (uncredited) | |
| Larry Wheat | ... | Minister (uncredited) | |
Directed by | |||
| Robert Siodmak | |||
Writing credits | ||
| Mel Dinelli | (screenplay) | |
| Ethel Lina White | (novel "Some Must Watch") | |
Produced by | |||
| Dore Schary | .... | producer (uncredited) | |
Original Music by | |||
| Roy Webb | |||
Cinematography by | |||
| Nicholas Musuraca | (director of photography) | ||
Film Editing by | |||
| Harry W. Gerstad | (as Harry Gerstad) | ||
| Harry Marker | |||
Art Direction by | |||
| Albert S. D'Agostino | |||
| Jack Okey | |||
Set Decoration by | |||
| Darrell Silvera | |||
Costume Design by | |||
| Edward Stevenson | (gowns) | ||
Production Management | |||
| Fred Fleck | .... | production manager (uncredited) | |
Second Unit Director or Assistant Director | |||
| Harry Scott | .... | assistant director | |
Sound Department | |||
| John L. Cass | .... | sound | |
| Terry Kellum | .... | sound | |
Special Effects by | |||
| Vernon L. Walker | .... | special effects | |
Visual Effects by | |||
| Chris Crowell | .... | digital compositor (restored version) (uncredited) | |
Music Department | |||
| C. Bakaleinikoff | .... | musical director | |
| Samuel Hoffman | .... | musician: theremin (uncredited) | |
Other crew | |||
| Edgar Peterson | .... | production assistant | |
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| So Sweet, So Dead | Rebecca | The Secret of Treasure Island | Sherlock Holmes Faces Death | Mildred Pierce |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Horror section | IMDb USA section |
This is a terrific thriller, made just the way that thrillers should be done, with nicely crafted tension, atmospheric setting, and plenty of strange and mysterious characters. Adding in the excellent leading performance by Dorothy McGuire makes it a top-notch picture.
From the very beginning, the suspense begins to build, while at the same time McGuire's character Helen immediately attracts and holds the audience's concern and sympathy. The combination works very well, and while you're never sure what else is going on, or which of the other characters can be trusted, you know that Helen is in danger and that you care about her.
The rest of the cast are all nicely matched with their characters, and do a fine job of bringing them to life. Some of the plot developments probably would prove somewhat implausible if analyzed carefully, but the story and atmosphere are crafted so effectively that you never notice while watching.
Anyone who enjoys classic thrillers should make sure to see "The Spiral Staircase".