Directed by
| Robert Siodmak | ||
Writing Credits
| Mel Dinelli | ... | (screenplay) |
| Ethel Lina White | ... | (based on the novel "Some Must Watch" by) |
Cast (in credits order) verified as complete
| Dorothy McGuire | ... | Helen | |
| George Brent | ... | Professor Warren | |
| Ethel Barrymore | ... | Mrs. Warren | |
| Kent Smith | ... | Dr. 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) | |
Produced by
| Dore Schary | ... | producer (uncredited) |
Music by
| Roy Webb | ||
Cinematography by
| Nicholas Musuraca | ... | director of photography |
Editing by
| Harry Gerstad | ||
| Harry Marker | ||
Art Direction by
| Albert S. D'Agostino | ||
| Jack Okey | ||
Set Decoration by
| Darrell Silvera | ... | (set decorations) |
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) |
Stunts
| Gordon Carveth | ... | stunt performer: woman falling down the spiral staircase (uncredited) |
Music Department
| C. Bakaleinikoff | ... | musical director |
| Samuel Hoffman | ... | musician: theremin (uncredited) |
Additional Crew
| Edgar Peterson | ... | production assistant |
