If you are looking for a chilling and thrilling crime fiction, this is for you. Out by Natuso Kirino is the winner of Japan's top mystery award and makes an outstanding read. This is about a group of friends, who find themselves in the midst of a brutal crime. Beyond the gruesome crime, the author's depiction of the main characters, especially Masako and Satake, provides an intriguing and enriching reading experience. Being a thriller, I don't want to divulge anything else and spoil the fun for you! ;)
