3 stars -- While this is an entertaining first mystery by Giff, there is too much other 'stuff' I can't ignore. Abby and her friend Potsie - whose name cracks me up because it's short for Penelope Olivia Torres - become involved in a double mystery. The first involves a sign on a power pole that Abby watches a girl rip in two. The sign mentions the missing 'Hyacinth Macaw' and a reward. The second involves the odd sounds coming from the apartment next door to Abby's. The girls find out fairly quickly that the apartment is empty, so what is the source of the whispered voice(s)? Add to these two events that Dan, Abby's brother, is acting suspiciously enough to perhaps be involved in a crime that Garcia, Abby's policeman friend, is investigating, which is theft from the pet store where Dan works, and you have the recipe for crazy suppositions, amateur investigations, and incorrect conclusions. The story is certainly entertaining. What bothered me, though, were the constant 'fat' references made about Kiki, the building super's daughter; the idea that something was stolen and then brushed under the rug; the convenient absence of Abby and Dan's parents to allow freedom for their kids; the aforesaid freedom to wander in a big city even at night despite their age; and Abby & Potsie's disregard for common sense and the law. I know this is a middle grade book, but some of this was a bit much even for that.