Publisher's Synopsis
Fifth-grader Mabel (code name Sunflower) wrote the Rules for a Successful Life as an Undercover Secret Agent, so when her parents leave town abruptly she is not too worried--but when her beloved Aunt Gertie is arrested, and her objectionable Uncle Frank and Aunt Stella (Frankenstella) and her annoying (but clever) cousin Victoria take over her house and the family's private museum, Mabel begins to smell a rat and she is. determined to find out what her suspicious relatives are up to.
