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K-Gr 2—The second mystery featuring the boy detective with a pie-chart body is built around shape concepts. When Margot's hat disappears, she asks Charlie and his dog assistant Watson to discover its whereabouts. Their school-wide search for a cone-shaped hat sets up opportunities to introduce and compare cylinders, spheres, and other shapes. Most of the geometry information is woven fairly seamlessly into the mystery plot. A ring of purple sparkly paint, for example, is a key clue but also demonst...Log In or Sign Up to Read More

Child sleuth Charlie must find a classmate's missing cone-shaped princess hat, which she needs for that evening's school play. The authors offe...Log In or Sign Up to Read More