In 'The Sleepwalkers' acclaimed historian and author of 'Iron Kingdom', Christopher Clark, examines the causes of the First World War. The moments that it took Gavrilo Princip to step forward to the stalled car and shoot dead Franz Ferdinand and his wife were perhaps the most fateful of the modern era.

1914: Young Anton Heideck has arrived in Vienna, eager to make his name as a journalist. While working part-time as a private tutor, he encounters Delphine, a woman who mixes startling candour with deep reserve. Entranced by the light of first love, Anton feels himself blessed. Until his country declares war on hers. 1927: For Lena, life with a drunken mother in a small town has been cosseted and cold. She is convinced she can amount to nothing until...