From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation!School is always fun in Ms. Colman's class!The kids in Ms. Colman's class are working on science projects. Bobby's group is studying a mouse named Harriet. Harriet is about to have babies. But then Harriet disappears. The science project is a big mess! And everyone thinks it is Bobby's fault.
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