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German-occupied territory, 1945. Tearing open the envelope, Katja studies every line and letter on the map. She wills herself to memorise it, copying every detail onto scraps of paper in the flickering candlelight. She’d nearly been caught delivering the letters by the SS that afternoon. Picturing Karl’s handsome face, her chest tightens. They’re in this together. But if she’s caught, what will happen to the baby?

London, present day. Jo is at a crossroads in her own life in her cosy bungalow on the edge of beautiful Hampstead Heath. Clearing out her mother, Katja’s, empty home, Jo’s world is turned upside down when she discovers a small, dog-eared diary stuffed into the back of a tiny kitchen cupboard. And tucked within its pages is a ripped, yellowed envelope with an unfamiliar, faded postmark. As she scans the scrawled handwriting, Jo can scarcely believe her eyes…

What really happened to that tiny baby all those years ago? And will this long-lost diary finally give Jo the answers to everything she’s been searching for?

Based on an incredible true story, The Lost Diary is a gripping and unforgettable tale about forbidden love and family secrets in World War Two. Fans of The Letter, The Nightingale and We Were the Lucky Ones will be utterly swept away.