This tale does double duty as an intriguing mystery and a primer on collective nouns for animals.A group of squirrels-called a "scurry"-express concern when a "mischief of mice" who once played in the woods disappear. After the squirrels ask other forest creatures what might have occurred and accuse still others of committing foul deeds, an aptly named "sleuth of bears" step in to solve the puzzle. The game's afoot-literally-as the bears wisely follow tracks in the snow, which lead them to a tree. Could the mice be inside? This delightful, clever book works on several levels: It's an atmospheric tale, told in charming, effortless rhyme, as well as a terrific vocabulary builder that introduces kids to collective nouns such as a "clutter of spiders," a "skulk of foxes," and a "gaze of raccoons." These group names are fun to know, and adults sharing this book with youngsters can extend the learning by exploring the backmatter, which offers more information on the collective nouns, and then by asking kids to consider how well these group names suit the creatures. The pleasant watercolor illustrations portray the animals and the autumn forest setting sweetly but realistically.Give a collective cheer for this tale that will charm kids while imparting fun facts. (Picture book. 5-8)