There are now six books in the series, although Lagercrantz has had to overcome the problem of how to handle someone else’s characters. His approach has always been to stick with the traits established in the original: the journalist Mikael Blomkvist continues to be a rather tedious womaniser, while the hacker Lisbeth Salander is a death-defying superhero. It is an honourable but limiting perspective, especially for someone who is an established author in his own right. The latest novel is a revenge drama, promising a final confrontation between Salander and her sister, a capricious woman who remains stubbornly two-dimensional. Blomkvist, meanwhile, is on the trail of a different plot that leads back to a doomed expedition on Everest several years earlier. It is the best part of an uneven novel that culminates in a slow-motion bloodbath, providing a predictable but sad end to the series.