Within two years of the battle of Bosworth Henry Tudor had to defend his crown against a formidable challenge mounted on behalf of a ten-year-old boy who had been crowned in Dublin as Edward VI. Though presented as the last surviving Plantagenet prince, the youth is generally known to history as Lambert Simnel. This book unravels the tangled web of dynastic politics and rivalries in Yorkist England, seeking a context for the bizarre events of 1487.