Young intern Jeff Burton, impulsively offers a lift to an odd-looking gentlemen. It soon turns out that Jeff's passenger is an inventor has just escaped from a shady sanitarium, where he has been held prisoner by Nazi spies.

Richard Carlson
as Dr. Geoffrey Burton

Nancy Kelly
as Pat Lindsay

Albert Bassermann
as Dr. Storm

Miles Mander
as Professor Langer

Edward Gargan
as Officer Charlie Prescott

Adrian Morris
as Officer John Prescott

Martin Kosleck
as George Taylor

Walter Kingsford
as Heydt

Cy Kendall
as Dahlig

Nestor Paiva
as Grube