Dr. Alwyn Ruddock was one of the best scholars to work on the North American discovery voyages of John and Sebastian Cabot (1496–1508). For thirty-five years scholars in this field awaited the groundbreaking volume Ruddock was said to be preparing on this subject. Yet, when Dr. Ruddock died in December 2005, aged eighty-nine, she ordered the destruction of all her research. This article examines the research claims she made in her 1992 book proposal to the University of Exeter Press and in her later correspondence with U.E.P. Her findings are so extraordinary that they will, if proved correct, transform our entire conception of the scale, nature and importance of John Cabot's achievements.