Britain lies uneasily at peace, and Arthur Pendragon, King of Britain, is secure in his stronghold in the heart of the Summer Lands. But ever the fighter, he defies the advice of his wife Gwenhwyfar to sail for France to defend his territories in Less Britain, leaving his country vulnerable without a leader.
When word comes that the Pendragon has fallen in battle, Gwenhwyfar faces overthrow by the powerful council headed by Arthur's uncle, anxious to reassert Roman ways. She must struggle to assure a future for herself and her small daughter, opposed also by Arthur's ambitious ex-wife Winifred.
But, unknown to Gwnehwfar, events abroad mean a far mightier battle for the Pendragon throne - and the very future of Britain itself - lies ahead.