In 2009, an extraordinary map of China was discovered in Oxford's Bodleian Library - where it had first been deposited 350 years before, then stowed and forgotten for nearly a century. Neither historians of China nor cartography experts had ever seen anything like it. It was so odd that experts would have declared it a fake - yet records confirmed it had been delivered to Oxford in 1659. The 'Selden Map', as it is known, was a puzzle that needing solving. Timothy Brook, a historian of China, set out to explore the riddle. His investigation will lead readers around this elegant, enigmatic work of art, and from the heart of China, via the Southern Ocean, to the court of King James II.