In the Woods, by Tana French

Years ago, three children disappeared into the woods near the small town of Knocknaree - only one was found. He was covered in blood and remembered nothing of what happened. Years later, that little boy is a grown man and is a detective with the Dublin Murder Squad. When a new child murder case pops up in Knocknaree, detective Ryan struggles to remember what happened to him all those years ago. 

This book is really hard for me to review because in some ways it was very, very satisfying, and in some ways it was dissatisfying. But the dissatisfying aspects were where realism meets mystery / police procedural. I guess the element of realism, and the fantastic writing, are why people consider this a piece of "literary fiction" (whatever that means). I can say that some of the twists were predictable to me, but I was still very interested in how the story was going to turn out. I can't say more without spoilers, so I'll leave it at that.