Above Suspicion.

Oxford University Professor Richard Myles (Fred MacMurray) and his new bride Frances (Joan Crawford) decide to honeymoon on the continent. Because they are American tourists and therefore "above suspicion," they find themselves commissioned by the British secret service to find a scientist who has developed a countermeasure against a new Nazi secret weapon. The couple look upon the search as adventurous and cross Europe seeking clues from clandestine contacts.