Astara, Eden, Puck and Blaize have been captured by the Siduri, greedy silver-faced women who live in the Dark Forest and capture prisoners in spider-like webs in the mists behind the Cataract River. They mesmerise their prisoners by making them eat enticing silver nuts, and force them to sew silver moondust into their clothes, and to sew nets to capture the moon. To make matters worse, Garton the Ghastly teams up with the Siduri, and strengthens their spells by using the stolen Plant Spell Book to enslave even more fairies who he wants to capture once and for all and eat for dinner. However, with the help of Goodewin s magical crystal ball and the pisky s glamour spell, Cedar works out a very clever way to awaken her friends from their trance in the mists, finally recover the Plant Spell Book, and to stop the Siduri from making the moon disappear altogether.