Worrals is finding the routine of service life dull - until a chance discovery puts her on the trail of a double-agent. The hunt takes her and her long-suffering side-kick Frecks to the seedy side of London - made all the more terrifying by the rain of bombs from the latest Blitz. Further twists and turns follow, until the girls find themselves marooned in Occupied France - and about to fall into the hands of the notorious Gestapo…