Of all the mysteries Bernard Samson has encountered, the greatest is his wife Fiona. Dedicated agent of the Service and a woman of secrets, she will risk everything to play the long game. As the truth about the decision that shattered their marriage is gradually revealed, the web of deception that has snared Bernard for ten years begins to unravel. In the gripping, tragic finale of the Hook, Line and Sinker trilogy, everything we thought we knew is brought into question.