First of all, I recommend this book, which I found very moving, the character of the mother is very touching, she said without concessions doubts and flaws. And it remains the mother of his son whatever he does. More generally, this book raises the question of another child that was and did not look like what we dreamed, responsibility or not parents in the development of their children to Ultimately, this mother is she responsible or not part of the massacre committed by his son, the question remains, and it is the finesse of the book. Is Kevin did not do this to finally come to her mother? I just regret that the character of the son is so totally "bad guy", it seems to me little credible. Hard to imagine such a child who knowingly hurt his sister. A little more complexity on the character for me would still brings more depth to the book, without avoiding of course the final massacre. Finally, a book that you think back, which reads like a detective story and which in addition is very well written, advise.