The Salzburg Connection — Helen MacInnes

In 1945, with their thousand-year empire falling around them and the Allies on their heels, the Nazis hide a sealed chest in the dark, forbidding waters of the Finstersee -- a lake surrounded by the brooding peaks of the Austrian Alps. There it lies for 21 years, almost forgotten, until a British agent decides to raise it from the depths . . .

The secrets he uncovers are far-reaching and lethal, and in Salzburg, Bill Mathison -- a New York attorney on the trail of a missing colleague -- finds himself drawn into the shadowy underworld of international espionage. Not knowing who to trust amidst the chaos, he is drawn to two beautiful women, one of whom will betray him.

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Alternate Blurb:

The chest had been hidden in a lake high in the Austrian mountains. The secrets buried there were as deadly as an unexploded bomb. Men had been killed because of it, and sudden death stalked all who searched for it.

Bill Mathison, a hardheaded young American, did not know that his routine business trip to Salzburg was to become a macabre journey through the dark and violent underworld of spies and murderers.

Death waited for him in the shadows. So did love. Two beautiful women . . . and one of them would betray him.