When a wealthy dog spots a ghostly figure haunting her kennel in the Catpathian Mountains, she come to Bones and Catson for help. The fourth book in Buster's Sherlock Bones mystery fiction series features 28 puzzles - including spot-the-differences, number chains and tangled line games - that are woven into the action, so the reader feels immersed in the exciting detective plot. 7+ A thrilling story, perfect for middle-grade readers.