Book Three in the Hook, Line and Sinker spy series
Bernard Samson is surrounded by puzzles and none more complex than Fiona, his wife, the mother of his children, a defector to the KGB. But as a mystery, she is by no means alone.
Tessa Kosinski, Bernard's socialite sister-in-law, is as faithful to Bernard and Fiona as she is unfaithful to her doting husband. Slowly, she is drawn from the bright lights of London to the murkiest corners of Berlin.