An escaped World War 2 Nazi doctor impersonates a murdered English doctor so he can work on a vaccination to protect the Germans in their planned germ warfare.
Robert Beatty
as Dr. Paul Rankin
Mervyn Johns
as Dr. Bruckner, the Beast of Ravensbruck
Margaretta Scott
as Sister 'Johnnie' Johnson
Nova Pilbeam
as Tracy Heart
Sybilla Binder
as Martha Lert
Marie Lohr
as Mrs. Cole
Karl Stepanek
as Professor Inman
Alan Wheatley
as M. W. Kennedy
