The Blackbird sisters—Nora, Libby and Emma—tackle their sixth arch mystery (after 2006's Have Your Cake and Kill Him Too
) set among Philadelphia's contemporary blue-blooded (and red-handed) set. When former child star Sweet Penny Devine goes missing and is presumed dead, her brother, Porter "Potty" Devine, opts for a memorial party and polo match instead of a funeral, which Nora, a society reporter, covers for a Philadelphia paper. The festivities falter after Nora discovers a severed hand that could be Penny's. Nora, Libby and Emma aid detective Ben Bloom in an investigation whose suspects include Potty; Vivian, Penny's cat-crazy sister; the Devines' former housekeeper's daughter, Julie Huckabee; Julie's missing father, Kell Huckabee; and Crewe Dearborne, a food critic. Sleuthing provides a welcome distraction for Nora, still grieving over a miscarriage and a little nervous about her engagement to Michael Abruzzo, son of a notorious New Jersey mobster. Martin's wicked observations about the horsy set enhance another fine-feathered mystery. (Mar.)