It happend on a honeymoon!
Frances and Richard Myles (Joan Crawford and Fred MacMurray) are newlyweds honeymooning in Europe on the eve of World War II. Unexpectedly, they find themselves commissioned by the British secret service to secure the plans for a new secret weapon masterminded by the Nazis (involving magnetic mines). The trail leads them to Innsbruck where they arouse the suspicions of a Gestapo chief.
Fairly good World War II-era Hitchcockian-type thriller directed by Richard Thorpe and starring Joan Crawford and Fred MacMurray, with Basil Rathbone and Conrad Veidt. Has a bit of a frivolity to it that perhaps prevents it from being a true, nail-biting thriller. That said, it's certainly entertaining enough, and Joan looks marvelous...