The Grace children are back for their fourth adventure in the quest to understand and protect Arthur Spiderwick's guide, a book that offers information about the faerie world. Mallory, the oldest, goes missing from a fencing match. The twins, Jared and Simon, must solve a riddle to save her from evil dwarves who want to create a world totally out of metal with their sister as their queen. This installment in the fast-paced series continues with short chapters and well-developed, likable characters. Black-and-white drawings enhance the suspenseful mood. Reluctant readers and fans alike will enjoy this adventure and look forward to the finale.–Krista Tokarz, Cuyahoga County Public Library, OH Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.