Karl Anton Verloc and his wife own a small cinema in a quiet London suburb where they live seemingly happily. But Mrs. Verloc does not know that her husband has a secret that will affect their relationship and threaten her teenage brother's life.
| Actor | Role |
|---|---|
 Sylvia SidneyMrs. Verloc | Mrs. Verloc |
 Oskar HomolkaKarl Verloc - Her Husband | Karl Verloc - Her Husband |
 Desmond TesterStevie - Her Young Brother | Stevie - Her Young Brother |
 John LoderTed | Ted |
 Joyce BarbourRenee | Renee |
 Matthew BoultonSuperintendent Talbot | Superintendent Talbot |
 S. J. WarmingtonHollingshead | Hollingshead |
 William DewhurstThe Professor | The Professor |
 Clare GreetMrs. Jones (uncredited) | Mrs. Jones (uncredited) |
 Aubrey MatherGreengrocer (uncredited) | Greengrocer (uncredited) |
 Austin TrevorMonocle Man (uncredited) | Monocle Man (uncredited) |
 Charles HawtreyStudious Youngster (uncredited) | Studious Youngster (uncredited) |
 Martita HuntThe Professor's Daughter (uncredited) | The Professor's Daughter (uncredited) |
 Torin ThatcherMr. Verloc's Visitor (uncredited) | Mr. Verloc's Visitor (uncredited) |
 Peter BullMr. Verloc's Visitor (uncredited) | Mr. Verloc's Visitor (uncredited) |
 Alfred HitchcockMan Walking Past the Cinema as the Light Is Renewed | Man Walking Past the Cinema as the Light Is Renewed |