The Millenium Quadrilogy?

Quercus will publish a fourth book in Stieg Larsson's Millennium series, written by Swedish author David Lagercrantz, in August 2015. Original Swedish publisher Norstedts Förlag announced today they had signed a fourth book in the series. Larsson died in 2004, before he saw his trilogy of novels, The Girl With the Dragon Tattoo, The Girl Who Played With Fire and The Girl Who Kicked the Hornet's Nest, become an international publishing phenomenon.

Lagercrantz is the co-author of I Am Zlatan Ibrahimovic, the 2013 autobiography of the Swedish footballer. Norstedts Förlag publishing manager Eva Gedin said in an email reported in Swedish newspaper Dagens Nyheter: "We are proud and excited to now have signed an agreement with David Lagercrantz who, urged by his agent Magdalena Hedlund, has undertaken the challenging task of providing Blomkvist and Salander a second life, in a fourth stand-alone part of the Millennium series."

Lagercrantz said: "I'm running and writing and it's insanely fun. It's an amazing world to step into."