This thriller combines a look at family dynamics with the resolution of a so-called "cold case" and Tana French's tremendous grasp of Dublin idiom makes the dialogue very entertaining to anyone who knows it well. Her principal protagonist is both a police officer and connected to the crime, in more ways than first appear to be the case. Although I enjoyed this book, I did feel that it was too long - some of the descriptive passages didn't really take the story anywhere, and the plot exposition was relatively slow. A plus, if you don't like to finish a book too quickly, but less so if hints/clues have been dropped with a clang you could hear on Mars and yet the answers are coyly retained for another 80 pages. Perhaps it was written with an eye to its conversion in due course to a film/tv drama - the flashbacks in particular are vivid and would work well in that context, but again are rather drawn-out in terms of what they add to the narrative. I have read another Tana French following this one and ordered a third, so I do like the writing, but I can think of other authors whose crime writing is leaner and therefore has greater impact.