Then she takes him to the home of her aunt, where they are captured by a Nazi spy ring led by Van Dyne, a man Mrs. Sorensen has already had unpleasant dealings with in Düsseldorf, Germany.

Van Dyne finds a message hidden on one of Mrs. Sorensen's cigarette papers, identifying her as "M47" and listing the names of neutral ships under which two German vessels are traveling.

[6][7] The TV Guide online review called it "An odd little comic thriller - who, except perhaps Michael Powell, would cast 47-year-old Cabinet of Dr. Caligari (1920) star Conrad Veidt as a light romantic hero?

"[8] Time Out wrote that "Less stylish than The Spy in Black, this espionage thriller is more fun, with its tongue-in-cheek plot revelling in Hitchcockian eccentricities".

"The brisk pace and its added touches of quaintness, made the film endearing in spite [sic] of the lack of any character study and the one-dimensional tone of the villains."