On the eve of World War II the redoubtable Simon Templar (better known as THE SAINT) finds himself in the imperial city of Vienna, his attentions divided between a very sensuous countess and some legendary diamonds — both of which he is trying to keep out of Nazi hands.
Since the days of the Holy Roman Empire, the legendary Hapsburg Necklace has been guarded by members of the Austrian nobility. But never before has it had so beautiful a protector as one Francesca, the Countess Malffy (also known as Frankie). And never before has it been so in danger of being stolen. For its hiding place, the Malffy ancestral manor, has recently been occupied by a new tenant — the Gestapo.
And as THE SAINT and Frankie plan a mission to retrieve the necklace, it becomes increasingly apparent that the Germans are not their only adversaries. Also vying for the crown jewels is a most unpredictable eccentric who is every bit a match for Simon Templar.