If you like true crime, Pretty Girls by Karin Slaughter (£9) will be right up your alley. Although it's fictional, this book still has the same thrills that come with true crime. It follows sisters Claire and Lydia who are leading very different lives. The one thing they have in common is that their sister Julia disappeared more than 20 years ago, and nothing has been the same since. When Claire's husband is killed and a teenage girl disappears, the sisters decide to work together to find out what's really happening.