Ann M. Martin, Charles Tang
(Scholastic Paperbacks Sept. 27, 2016)
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.