The serpent and the grail

"The boy-king Arthor has beaten back the berserker wolf warriors of the Saxon god, uniting his island kingdom. The Grail, the chalice of the Last Supper and the magical shield of Britain, has been stolen. To find the Grail, Arthor's mother Ygrane must strike a dark bargain with Bright Night, elf-prince and Merlin must use his magic to show the way. But it is Arthor himself who must confront the Serpent, sword in hand."--Back cover.