Bestselling author Sofi Oksanen answers readers' questions about her novel Purge. It's a harrowing story of sexual violence, betrayal and retribution which charts the troubled history of Estonia during and after the Second World War. Told through the lives of two women, the story starts when a frightened stranger, Zara, arrives on Aliide's doorstep. Gradually, their parallel stories, and connected histories are uncovered. This powerful novel has been translated into 38 languages. (Picture: Author Sofi Oksanen. Photo credit: Toni Härkönen,)