Richard Mason

Humphrey Bogart

Evelyn Turner

Alexis Smith

Dr. Mark Hamilton

Sydney Greenstreet

Prof. Norman Holdsworth

Charles Drake

Kathryn Mason

Rose Hobart

Dr. Grant

Grant Mitchell

Det. Lt. Egan

Patrick O'Moore

Nora Grant

Ann Shoemaker

Phillips (uncredited)

Edwin Stanley

Robert Freston

Frank Wilcox

Detective Lt. Workman

James Flavin

Guest at Rainbow Lodge (uncredited)

Bess Flowers

Mrs. Allman

Mary Servoss

Pawnbroker #1 (uncredited)

Oliver Blake

Nurse

Doria Caron

Pawnbroker #2 (uncredited)

Harlan Briggs

Cab Driver

Ray Hanson

Pickpocket (uncredited)

John Harmon

Cab Driver

Billy Wayne

Highway Patrolman

Ralph Dunn

Switchboard Operator (uncredited)

Marjorie Hoshelle

Receptionist

Frances Morris

Harris

George Carleton

Prof. Berens

Wallis Clark

Desk Clerk

Jack Mower

Luggage Salesman

Emmett Vogan

Detective Lt. Egan

Pat O'Moore

Bellboy

Bruce Bilson