In July, I finished reading The Girl in the Spider's Web by David Lagercrantz. This is the fourth novel in the Millennium series. It is the first novel in the series not authored by the series' creator and author of the first three Millennium books, Stieg Larsson. Larson died of a heart attack in 2004. I read the first three books in the series in 2010: The Girl with the Dragon Tattoo; The Girl Who Played with Fire; and, The Girl Who Kicked the Hornest Nest.
Lisbeth Salander and Mikael Blomqvist return as the main characters. The plot combines a number of diverse elements, including hacking into the NSA; an autistic savant; industrial espionage and artificial intelligence. Additionally, Salander's childhood is explored to a greater detail than I remember from the first three books.
Although it doesn't have the style and translation idiosyncrasies of the first three books, it is not a bad book. I would grade it a solid B. If you read the first three books, I recommend the book as a continuation of the series.