In The Woods, by Tana French

This is the most engaging, can't-put-it-down book I've read in a while. Set in Ireland, it follows a pair of police detectives through a murder case with ties to one of the detective's childhood traumas. The relationship between the detectives and the third detective assigned to help them nicely parallels the childhood relationships of the traumatized one. The mystery is thick and full of twists and turns, and while it doesn't answer every question, is ultimately satisfying in the end, even if I felt a little sad not to know every secret at first. Really fascinating.