A Scotland Yard undercover detective is on the trail of a saboteur who is part of a plot to set off a bomb in London. But when the detective's cover is blown, the plot begins to unravel.
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|Sylvia Sidney||Mrs. Sylvia Verloc (as Sylvia Sydney)|
|Oskar Homolka||Verloc - Sylvia's Husband (as Oscar Homolka)|
|Desmond Tester||Stevie - Sylvia's Young Brother|
|John Loder||Detective Sergeant Ted Spencer|
|Matthew Boulton||Superintendent Talbot|
|William Dewhurst||Professor A.F. Chatman|
|Bernard Knowles||Director of Photography||