The Defector by Daniel Silva

The Defector (Gabriel Allon) -
Grigori Bulganov, Russian spy, after defecting is living in London, England. He vanishes on his way to the final chess game in a tournament. When Gabriel Allon finds out about Grigori’s disappearance, Gabriel determines that he has been abducted by Russian arms dealer Ivan Kharkov and sets out to rescue the man who once saved his life. While he is planning his rescue, Gabriel’s wife is also abducted by Ivan. Ivan’s goal is to get his children back who are living with their mother in the U.S.