The Griffin's RiddleBook - 2015
"Ten-year-olds Pearl and Ben, continuing their apprenticeships at Dr. Woo's Worm Hospital, discover that Dr. Woo and the sasquatch are both sick with Troll Tonsillitis, and they must travel to the Imaginary World to find the only cure: a griffin's feather"--Provided by publisher.
Publisher: New York : Little, Brown and Company, 2015.
Edition: First paperback edition.
Characteristics: 221 pages :,illustrations, map.