A British agent poses as a Nazi in order to rescue a Czech inventor
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.