Mabel Opal Pear and the Rules for Spying -- Paperback / softback

But when her beloved Aunt Gertie is arrested for leading a smuggling ring, then her obnoxious Uncle Frank and Aunt Stella show up, demanding to be let into the family's private museum . Using her self-authored spy handbook, will Mabel be able to find her parents and unmask the real criminal before it's too late?