Help with book mystery

Hello Everyone, I am trying to track down a book for a friend. Does this ring a bell for anyone? " a children's book from late 1980's where a chemist and rat switch places in a cage after the rat and female assist create a potion or something like that. It was nicely illustrated and very fun to read. Caroline read it around 1993 in paperback. I would love to get a copy. Thanks" Sincerely, Nyama Nyama Y. Reed Library Director N.Reed@WFBLibrary.org 414-755-6551 (direct line) Whitefish Bay Public Library 5420 North Marlborough Drive Whitefish Bay, WI 53217 414-964-4380 (main line) Our Mission The Whitefish Bay Public Library, as a cornerstone of the community, is dedicated to connecting people of all ages, inspiring a love of learning and providing easy access to ideas, information and resources. *Please be advised electronic mail becomes a "public record" as allowed under public record laws when sent or received as part of normal business processes.
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Reed, Nyama