On 13 October 1939, HMS Royal Oak, one of the British navy’s top battleships, was destroyed at the Royal Navy’s main anchorage at Scapa Flow, Orkney. The audacious attack, by a German U-boat, was the first major blow against Britain of the Second World War. Over 800 lives were lost, including sailors as young as 14. This book is a revealing account of the tragedy. Told through declassified photographs and naval records, as well as statements from survivors, it is a dramatic and moving reassessment of one of the most shattering events in British naval history.