This book is “supposed” to be a continuation of the Millenium trilogy written by Stieg Larsson.
After Larsson’s death by a heart attack in November 2004, there is a lot of speculation about some remaining work found by his wife in his PC:
“Eva (Gabrielsson) says in the book that she could finish the fourth manuscript but is, as of this moment unable to due to the legal dispute between her and Stieg Larsson’s father and brother. The Swedish title of the fourth book is also told, and is said to be “Guds hämd” (english translation: God’s revenge).”
However Eva told BBC Womans Hour that there will be no 4th book.(See interview on Youtube). The few notes he left on his computer have been grossly exaggerated.
So how come the actual book written by the Swedish journalist David Lagercrantz?
From Wikipedia: According to the publisher, the book will be a stand-alone sequel based on Larsson’s characters, but will not make use of the incomplete book manuscripts and notes he left behind. Lagercrantz, however, stated in an interview with Aftonbladet that he plans to pick up some of the unfinished plot threads from the published novels.
However, there is still some controversial issues concerning its copyright, Aftonbladet: ”Lagercrantz har stulit min bok” (“Lagercrantz has stolen my book”).
So, what about the book itself?
The plot involves a case of computer hacking (always present in the original Millenium series) into the NSA (a quite contemporary fact). In parallel, a mute and autistic boy witnesses a crime scene and the key solve this is looked in his mind and might or might not be revealed in a drawing.
In this scenario (no spoilers here), Michel Blomqvist and Lisbeth Salander come up: while Michel is more interested in writing a good article to “Millenium”, Lisbeth tries to reach the boy’s mind by giving him some prime numbers challenges in order to encrypt a NSA document.
In my humble opinion, this book doesn’t reach the same level as the Larsson’s books, even if the author tries to use similar schemes for its plot. To be checked (or not).