Anna Neagle ("Sally") is quite efficient as the supposed Nazi sympathiser who abandons her family in a frequently bombed London and heads to the safety of Nova Scotia. En route, she attracts the attention of both the suave Polish officer "Jan Orlock" (Albert Lieven) and of the apparently hapless British one - Richard Greene ("Garrick") on the boat. On arrival, she befriends the mother of "Orlock" (Lucie Mannheim) and our story of espionage and counter-espionage begins in earnest. Nobody is exactly - or even remotely - whom they say they are and Herbert Wilcox manages to keep us guessing for much of the film, helped by three decent lead performances and quite a good story. Margaret Rutherford has some fun, in her very typical fashion to add a bit of light comedy (and sheer bloody mindedness) to the mix too and all told, this is a gently engaging tale of courage and bravery that is just about plausible.