'Asne Seierstad is the supreme non-fiction writer of her generation ... Two Sisters isn't only the story of how a pair of teenage girls became radicalised but an unsparing portrait of our own society - of its failings and its joys' Luke Harding

On 17 October 2013, teenage sisters Ayan and Leila Juma left their family home near Oslo, seemingly as usual. Later that day they sent an email to their unsuspecting parents, confessing they were on their way to Syria. They had been planning the trip for months in secret.

Asne Seierstad - working closely with the family - followed the story through its many dramatic twists and turns. This is, in part, a story about Syria. But most of all it is a story of what happens to apparently ordinary people when their lives are turned upside down by conflict and tragedy.

'A masterpiece and a masterclass in investigative journalism' Christina Lamb, Sunday Times

'Meticulously documented, full of drama ... this is a tale fluently told, and a thriller as well' Kate Adie, Literary Review

'A masterwork. Brilliantly conceived, scrupulously reported and beautifully written, this book is compulsive reading' Jon Lee Anderson