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Gr 4–6—Alice, a 12-year-old math whiz who likes a challenge, investigates the disappearance of Dr. Learner at the request of her schoolmate Sammy Delgado. Dr. Learner, the lead scientist at Delgado Industries, was working on an invisibility suit. Did his research cause him to disappear, or were there nefarious goings-on? This plot-driven mystery abounds with danger and red herrings. The author indicates socioeconomic class through the ch...Log In or Sign Up to Read More