Richard Carlson as Steve Smith ("Whispering Smith")

Rona Anderson as Anne Carter

Greta Gynt as Louise Balfort

Herbert Lom as Roger Ford

Alan Wheatley as Hector Reith

James Raglan as Insp. Dave Meeker

Daniel Wherry as Dr. Taren

Danny Green as Cecil

Reginald Beckwith as Manson

Michael Ward as Hotel Desk Clerk

Stanley Baker as Reporter

Laurence Naismith as Parker

Dora Bryan as Miss La Fosse