“Mapping” is the focus of this Level 3 title in Stuart’s popular MathStart series. The Elm Street Kids’ Club finds an old map leading to a buried time capsule; full-bleed illustrations appear throughout as the children follow the map’s clues. Leave it to Tusa, though, to add to the story as the presence of a giant (legs sticking out from under the map; disappearing into a door in the hill; face peering over the landscape) suggests something else is up. The clues, however, don’t require much mathematical thinking at all. “Walk 125 steps” is about as math-oriented as they get, though they do double the number later. Although sections of the map are occasionally enlarged, readers really can’t follow along even to test their skills of turning left or right or noting where the symbols lie without going back to the second page. As a stand-alone story, this one is weak, made appealing by Tusa’s fancy. A few mapping activities are included in the back that prove the most useful aspect of this questionable purchase. (Picture book/nonfiction. 7+)