This is a very clever thriller for its many fascinating details, its splendid dialogue and its total unpredictability. Anna Neagle makes a performance to go down in history, if all her other films will be forgotten, this one will not. Richard Greene also makes one of his best contributions, but the major male actor here is Albert Lieven as the Polish officer, who also makes probably his best performance. He was later to play the lead in "Beware of Pity" (on Stefan Zweig's famous and only novel) but is rather bleak there in comparison with this fascinating character; but this film is full of double characters, as if the major theme of the story and film was just that: double role play.
Herbert Wilcox, director and producer and Anna Neagle's husband, made his mark by witty innovations and brilliant dialogue, which places this spy thriller on a higher level than most, especially of the period. The intrigue is fascinating all the way, as you never can guess what will happen next, the film actually starts off with a profound mystery, as a man is found dead where someone just has been signalling to the Nazis bombing London in the 1940 Blitz, a mystery which leaves you hanging, and it's not until late in the film when you almost already have forgotten it that it is resolved.
The very introduction to the film is also worth a remark. Like in "Hamlet" two watchmen are chatting in the fog at night when the Blitz comes, but what they are discussing is Shakespeare. The other says Bacon, and there is an argument about it, until the second quotes Doctor Johnson: "If Bacon didn't write Shakespeare, he certainly missed his chance."
The scene is London and Canada, that is Halifax in Nova Scotia, and you reach the other scene exactly half way into the film, where Anna Neagle is stranded as a suspect spy or as a security risk placed under constant surveillance, while there is much more to it than that, as the action will prove.
Lucie Mannheim also makes a fascinating performance as the old lady Orlock, but the real original treat is Margaret Rutherford as one of her many delightfully eccentric old ladies - she dominates every scene she is in and gives a special relish of refreshment to the whole film.
In brief, this is and remains a timeless treat for everyone who would enjoy being intrigued.
