Lance, the lonely and beleaguered son of a domineering American business tycoon, hates his life but feels powerless to escape it. When he is sent to Bristol for a year to learn about the British branch of the family firm, he doesn't expect anything to change for him, until he meets a mysterious young woman named Gwyn in a woodland glade, and she begins to teach him about the ancient British legend of King Arthur and Avalon. Both Lance and Gwyn are isolated, controlled by powerful and cunning relatives, but together they are drawn back again and again to the clearing in which they met, compelled by unseen forces, and as the pair become closer, it soon becomes clear that their bond with Avalon goes deeper than either of them realised...