The Trespasser by Tana French
There’s the murder squad you set your sights on at the beginning: the one where you’re playing knife-edge mind-games with psycho-pathic geniuses. And there’s the one you actually work on. The night shifts. The vicious pranks that go too far. Sifting the dregs for the case that might just be special. Tonight’s case isn’t it. Uniforms call it in as a slam-dunk domestic. Except when Detective Antoinette Conway of the Dublin Murder Squad, takes a good look at the victim’s face, she realises she’s seen her somewhere before. And she knows there’s a different answer. And it takes her breath away.