Margaret Lockwood (Anna Bomasch)
Rex Harrison (Gus Bennett)
Paul Henreid (Karl Marsen)
Basil Radford (Charters)
Naunton Wayne (Caldicott)
James Harcourt (Axel Bomasch)
Felix Aylmer (Dr. John Fredericks)
Wyndham Goldie (Charles Dryton)
Roland Culver (Roberts)
Eliot Makeham (Schwab)
Raymond Huntley (Kampenfeldt)
Austin Trevor (Captain Prada)
Kenneth Kent (Controller)
C.V. France (Admiral Hassinger)
Frederick Valk (German Officer at Munich Station)
Morland Graham (Teleferic Attendant)

When the Germans march into Prague, Czech scientist Dr Bomasch flees to England, taking with him his secret new armour-plating formula.

His daughter, Anna, however, is arrested and sent to a concentration camp. Once there, Anna immediately attempts to find a way of escape.

In the meantime, the Nazis will not rest until they find Anna's father and his formula...

Basil Radford and Naunton Wayne reprise their roles as Charters and Caldicott from The Lady Vanishes.