This is the first Lars Kepler book I have read - I don’t think I needed to have read them in any order as you get the jist of the characters. I found the characters interesting and would like to know more about them by reading other books in the series. The ending provides a good closure for the main characters but an open ending for others which is enticing. This was a bit too violent and sexually explicit at times for my normal tastes in books. But with a large following of readers I’m sure not everyone agrees with me.