This was one of the best thriller/psychological suspense/family saga/mystery I have ever read. Ms Flynn has a terrific ability for description and development of very interesting characters.  She puts you right there in the middle of the story. I couldn't put it down.  It has twists and turns and a double ending.  As much as I enjoyed this book, there was much dark and depressing elements of the story that I cannot forget.  I'll wait awhile before I read Dark Places, the only other novel I have left to read that she has written. It's not that I don't want to read it.  I just want go save it and let the novel just finished digest a bit.  Actually looking forward to Dark Places.  Hoping she will have another novel published soon.  She is one writer that I intend to keep reading. I did read Gone Girl last year and loved it. But somehow it did not have the same kind of experience for me. It was a great novel but very different .  Highly recommend this if you like real psychological thrillers.  And some parts require  a strong stomach.  But so filled with dysfunction and disordered lives that are wonderfully written, no matter how difficult it may be to read. It is a unique kind of book. Not for children and adolescents in my opinion. Some very heavy material and necessary but ugly descriptions of things better left for mature adults. It all comes together and leaves you breathless. 

Question: How is the book?
Answer: psychological suspense family saga / mystery