The Tristan Betrayal by Robert Ludlum

Despite the fact that this book has no characters in it named “Tristan”, Robert
Ludlum has won me back. Hooray. This is a great
book. Exciting and not unrealistic to the point of stupidity.

Because of novels like this one I am developing a genuine interest
in WWII history.

From the Website

In the fall of 1940, the Nazis are at the height of their power – France
is occupied, Britain is enduring the Blitz and is under the threat of invasion, America
is neutral, and Russia is in an uneasy alliance with Germany. Stephen Metcalfe, the
younger son of a prominent American family, is a well-known man about town in occupied
Paris. He’s also a minor asset in the U.S.’s secret intelligence forces in Europe.
Through a wild twist of fate, it falls to Metcalfe to instigate a bold plan that may
be the only hope for what remains of the free world. Now he must travel to wartime
Moscow to find, and possibly betray, a former love – a fiery ballerina whose own loyalties
are in question – in a delicate dance that could destroy all he loves and honors.