A masterpiece of a thriller. Brutal, gripping, intelligent. It left me breathless. ? Liza MarklundBreathtaking and terrific...Knock Knock is one of the best crime novels this reviewer has read in a very long time. ? Jyllands-PostenOne of this year?s very best crime novels, that will keep even the most well-read and quality-conscious crime readers in a breathtaking iron grip from beginning to end. ? DBC, DenmarkAn edge of your seat thriller about revenge and treachery during three fateful days. ? Vi Läser, SwedenWith a novel like this in your hands the desire to read becomes extraordinary; everything else turns into distractions that keep you from lustfully devouring the next page. ? Mariestads-Tidningen, Sweden Biografía del autor Anders Roslund has published ten novels to date as part of the successful writing duos Roslund & Hellström and Roslund & Thunberg. His books have been read by millions and he is the recipient of numerous prestigious international awards. Knock Knock is the first novel published under Roslund?s full name.