Broken Harbor by Tana French, guc

MICK "SCORCHER" KENNEDY, the brash cop last seen in Tana French's New York Times bestseller Faithful Place, plays by the book and plays hard. That's why he's the Murder Squad's top detective, and that's what puts the biggest case of the year in his hands. On one of the half-abandoned "luxury" developments that litter Ireland, Patrick Spain and his two young children have been murdered. His wife, Jenny, is in intensive care. At first, Scorcher and his rookie partner, Richie, thinks it's going to be an easy solve, but too many small things can't be explained: the half-dozen baby monitors pointed at holes smashed in the Spains' walls, the files erased from the family's computer, the story Jenny told her sister about a shadowy intruder slipping past the house's locks. And this neighborhood-once called Broken Harbor holds memories for Scorcher and his troubled sister Dina: childhood memories that Scorcher thought he had tightly under control.