Simon, Jane, and Barney, enlisted by their mysterious great-uncle, arrive in a small coastal town to recover a priceless golden grail stolen by the forces of evil -- Dark. They are not at first aware of the strange powers of another boy brought to help, Will Stanton -- nor of the sinister significance of the Greenwitch, an image of leaves and branches that for centuries has been cast into the sea for good luck in fishing and harvest. <br> Their search for the grail sets into motion a series of distubing, sometimes dangerous events that, at their climax, bring forth a gift that, for a time at least, will keep the Dark from rising.
