Greenwitch (The Dark is Rising Sequence), Paperback Book, By: Susan Cooper

And Those Who Are Crossed, or Barren, or Who Would Make Any Wish, Must Touch the Greenwitch" The Dark has stolen an object of great power a golden grail that holds a vital secret. Will embarks on a new quest to reclaim the grail, and to drive back the Dark once again. But first he will need the help of three former grail seekers: Jane, Simon, and Barney Drew. Learning to work together, they must take back the grail and retrieve the missing manuscript that unlocks its mystical secret. But the manuscript is located at the bottom of the sea, and their only hope of obtaining both grail and script is entangled in the mysterious ritual of the Greenwitch.