Ronan, bastard son of Lancelot of the Lake and last of King Arthur's knights, has been charged with a quest — find the Holy Grail. Merlin sends him forward in time to seek the relic, promising he'll know the keeper of the grail by a sigil. If he fails, all is lost.

Morgan Foster bears the magical symbol in the form of an ill-conceived tattoo but has no idea what to make of this hot, possibly crazy man who lays siege to her body and heart.

Timeless magic and breathless passion bring them together, but is their love strong enough to survive when the battles of the past rip their fragile future apart?