Britain, under the influence of Mab, powerful Queen of the Old Ways, remains a place where magic holds sway and controls the hearts and minds of men. Merlin, Mab’s champion, has now become her sworn enemy. When Mab’s sister, the Lady of the Lake, gives Merlin Excalibur he must ensure that it reaches the man Mab fears most: Arthur Pendragon. But Mab has her own disciple – or pawn. Morgan Le Fay, Arthur’s half-sister, gives Mab the weapon she needs to ravage Arthur’s kingdom and Merlin’s dream of peace: a child. Mordred.