Young Gervaise Tresham leaves England and the turmoil of the Wars of the Roses to become a Knight of St. John. Starting as a page of the Grand Master, Gervaise quickly attains knighthood and defends Europe and Christendom against the anarchy of piracy in the Mediterranean and the expansion of the Turkish empire. Sir Tresham is there to defend the fortress at Rhodes during the first siege of that city by Soleiman.