Forget two seconds that the author is the mother of Harry Potter and take this novel for what it really is. Here, no place for the young and even less the little ones. The universe of this social fiction is definitely adult and offers a realistic vision, sometimes disillusioned in our society. The plot is difficult to set up because you have to spend the presentation of the protagonists of kinship (just how Millennium) but then the machine is started, and it's a nice, fluid and controlled pen that offers us a good story , which is reminiscent of "The Ax" by Donald E. Westlake, an American novel adapted by Costa-Gavras and released in France in 2005 (José Garcia in the title role). Déjà vu course, but to JK Rowling give the benefit of doubt and expect his next literary production.