The Seven Grail Realms
Volume 1: Nineves Gambit
King Arthur has left Logres for Annwn and the Grail treasures are lost, among them the Sacred Staff. Medrawt, through his inconstant sorceress, Nineve, seeks the Staff, which was divided into five pieces by Gawain, its guardian, before he too followed Arthur. Gwenhyfwr, turns to Gawain's grandchildren, two from this world and two from her own, for help to secure them from the enemy.
Volume 2: The Search for Lady Anna
Anna is missing but there are sinister clues to her whereabouts. Her daughter, Bryony, fears that the sorceress, Nineve, has abducted her. So, together with Gavin, her half-brother, she returns to Gwenhyfwr's realm of Logres, resolved to find her mother. Both must undertake an arduous voyage over dangerous seas but first there an incursion by Medrawt's forces to counter.
Volume 3: The Brandubh
Bryony is suffering from the loss of Loholt during the attempt to rescue her mother and is determined to seek retribution from Nineve, while Gavin is distracted by his first real love, Clionna; nevertheless, the search for the Grail treasures must continue. Their endeavours lead to the unmasking of the true enemy, the brotherhood of the Brandubh.
Volume 4: The Resurgence of the Dryw
Discovering the identity of her adversary to be Morgan, Gwenhyfwr forms an uneasy alliance with Medrawt. In a climactic battle at Morgan's stronghold, Bryony resorts to subterfuge to destroy him and his ultimate weapons, the wyverns. Meanwhile, Yvaise opposes the insurgence of the cruel priesthood, the Dryw, exhorting all in Logres to stay true to Arthur's covenant.
Volume 5: The Benighted Kingdom
With Morgan subdued, Gwynhyfwr can now look to the east and sends her newly appointed commander, Aethelstan to repulse Heolstor's Saxon invasion. In disgrace and no longer Gwynhyfwr's champion, Bryony assists by fighting her own war of resistance. Meanwhile, in pursuit of the Grail treasures, Gavin returns to England with Yvaise, who is astounded by the modern world.
Volume 6: The Dissolution of Logres
Arthur's sword must be recovered, so Gavin, along with his half-sisters Yvaise and Bryony, are sent to find it. In her final act as Queen, Gwenhyfwr abdicates in favour of Aethelstan. As Logres disintegrates Bryony and Gavin know they must face the dilemma of whether to return home to England or reside forever in the failing kingdom.