A sweeping chronicle of love, treachery, and magic, spanning eight centuries and two universes. In one universe the king is a myth, in another he is dead, and in a world-between-worlds, he is sleeping. While he sleeps there can be no end to the war that ravages his ancient kingdom. As the rising of Excalibur breaks the barrier between worlds, ancient myth becomes terrifying reality as magic slips between universes. Dragons darken the sky above Stonehenge An assassin from another world stalks the streets of London A peasant boy travels through time to secure the throne of two worlds An ancient sorcerer casts a last desperate spell Two reluctant companions, Violet, a surprising psychic and Ryan, a renowned historian, follow clues in an ancient document to find the hiding place of Excalibur. Their perilous quest will challenge everything they have ever believed. But first they must learn to believe in each other, before they can believe the impossible – and perhaps that is the most impossible task of all.