Kevin Wignall, The Traitor's Story

Finn Harrington is an ex-spy who's spent the six years since he left the business writing popular history books. He lives in Switzerland with his girlfriend, Adrienne, and with a vague sense that his past will one day come back to haunt him. It does in this story when Finn agrees to investigate the disappearance of his neighbors' teenaged daughter. Turns out that she unwittingly dredged up ghosts from Finn's past, and we learn about them in historical chapters that are interlaced with the modern narrative. In order to reclaim his life with Adrienne, Finn has to put those ghosts to rest. I really enjoyed this book. It took a little effort to keep the timeline straight as the author's switching between the modern-day and historical chapters was sometimes confusing. But that's my only complaint. Finn is a complex, interesting character, a flawed hero for whom "nothing much had mattered" for a long time when the book opens. It's enjoyable to watch him find his way after six years of living a life of shadows.