Starting out in the Wyndham Mansion, Werewolf Derik is ordered by his alpha, Michael Windham, to go to California and find the reincarnation of a powerful sorceress - Morgan LeFay, half sister of King Arthur - and stop her from what ever she is doing by "taking care" of her.
Upon his arrival in Monterey, California, Derik discovers that the reincarnation of Morgan LeFay is a gorgeous but benign medical doctor named Sara Gunn, who has had a string of the most unlikely luck since the day she was born, but has no intention whatsoever to destroy the world.
During the trip across the country, Michael tries and succeeds to cajole Sara - who is initially rather not very fond of Derik because he has tried to kill her, but adores his gorgeous body - into sleeping with him by means of several lies and half-truth.
Over the next days during the trip, Sara falls under Derik's spell, and when he finally tells her that he has cheated her into sleeping with him, she rejects him at first, but shortly after, they confess their love to each other.
The interrupted spell sets free a demon who immediately starts to kill everyone, and would - as Sara sees in a vision - have extinguished all life on earth.