The Keeper by Tana French (Viking, £16.99) The final book in French’s Cal Hooper trilogy sees the retired Chicago detective drawn into a power struggle for the future of the small Irish town he has made his home. Ardnakelty is a place where everyone is interconnected, with grudges and loyalties lasting for generations, and Hooper, now engaged to local widow Lena and mentor to 16-year-old Trey, is becoming a part of its fabric. When the body of Rachel Holohan, girlfriend of the son of local bigshot Tommy Moynihan, is recovered from the river, the consensus is suicide, but Trey convinces Hooper to investigate. Tommy doesn’t like people interfering in his business, especially when it emerges that Rachel was concerned about his plans for the town. An immersive, slow-burn of a book, as much about the march of time and the inevitably changing nature of Irish rural life as it is about solving a crime, The Keeper is dense, compelling and superbly atmospheric.…