I have read all of Tana French's novel, beginning with In the Woods. I enjoy her books because they not only delve into a complicated mystery, but also reveal the very human side of the individuals involved. 
 In this case a family of four is found murdered in their home in a new housing development. With no signs of forced entry and no visible motive, it is up to Mick "Scorcher" Kennedy (one of the top detectives with the Dublin murder squad)to find answers. He is up against a rookie partner, a complicated thread of evidence and one of the victims actually surviving the attack. 
 Lots of twists and turns with a surprise ending. Another great read by Tana French!