Aminta Dyne

A beautiful Austrian refugee in England--who is also a Nazi agent--marries a scholarly English pacifist. He lives near a secret military base she needs to get information about so she can help in Hitler's planned invasion of England.

A scientist who has found a way to prolong life (he is 120 years old) finds himself in a dilemma: he has fallen in love, and he has also discovered that if he doesn't get new glands, he will die.