Book excerpt: In fifth-century Britain, only a few souls believed Merlin the Enchanter's prophecy, that the "once and future king" called Arthur would one day rescue them from fierce and deadly Saxons. In a world where "king" simply meant "warlord," many wondered: would there even be a Britain left for Arthur to rule once he was born and old enough wield a sword of his own? One man refused to let that dream fade into nightmarish despair ...