The Tristan Betrayal - Robert Ludlum *****

The main plot of this book takes place in Moscow during Stalin's rule. The times are when Hitler is advancing in Europe with full force.
One of the best plotted spy ring novels. There are surprises at every corner. Its the story of a genius spy, bound to keep your attention till the very last. I do not want to say anything more about the book as it might give away the small surprises hidden in every page.
A must read.