William Avery Bishop is recognised as the British Empire's highest-scoring WWI ace, credited with 72 combat victories, third-ranking behind von Richthofen and René Fonck. He scored many of his successes on his own, prevailing only by dint of personal courage, daring and superior marksmanship. This remarkable man's story has been detailed in many books and articles, but renowned author Peter Kilduff is adamant that so far the full truth has not been told. Famed for his even-handed, thorough, exhaustive and forensic research, Kilduff sets out to bring new light to missions and kills so far steeped in controversy. As so many of Bishop's victories were achieved during solo combat, all will be examined and scrutinised, drawing on German, British and Canadian archival sources, Bishop's private correspondence, and accounts by friends and foes. Such an approach provides as complete an account as possible which also serves as a valuable reference work containing many previously unpublished images.