The Scarlatti Inheritance      by Robert Ludlum

Her weapons: money and power. Her target: the most dangerous man in the world--her own son. Elizabeth Wyckham Scarlatti has a plan, a desperate, last-minute gamble designed to save the world from her son, Ulster, an incalculably cruel man who is working for the Third Reich under the name of Heinrich Kroeger. If Elizabeth cannot stop him, Ulster will give Hitler the most powerful instrument on earth.

 

Also by Robert Ludlum

 

Also from 1971