Grail

Drought, plague and war have left the Isle of the Mighty battered and its heart, the beloved Arthur, grievously injured. But, astonishingly, the High King lives - his wounds healed and vigor restored by a sacred and secret relic: the Holy Grail.
At Ynys Avallach, a dying Arthur was miraculously renewed. And now, in this time of rampant disease and death, the great king wants to share the Grail's curative powers with all who require it. A shrine will be built to house the holy treasure - and Arthur's fabled Kingdom of Summer will at long last come to be.
But evil has entered the royal court in the guise of a beautiful maiden. Unbeknownst to Arthur, to his devoted warriors, to his adored Gwenhwyvar...even to the bard Myrddin, the sage Emrys whom some have called "Merlin," malevolent forces, soulless and cunning, seduce the King's most loyal champion. And in an unthinkable unguarded moment, the Grail is carried off, vanishing somewhere into the dark unknown.
Now Arthur faces the greatest challenge of his sovereignty: a quest to recover the lost Grail that will lead the noble liege and his Dragon Flight through realms of magic and the undead...on a trail winding relentlessly toward a grim confrontation with his most foul nemesis, Morgian, Queen of Air and Darkness.