As Gregor Demarkian's Philadelphia neighbor Donna Moradanyan lurches toward her dubious wedding--will she go through with her vows to faithful cop-turned-lawyer Russell Donahue, or will she get waylaid again by irresponsible Peter Desarian, father of her son Tommy?--marriages seem to be flying apart all over the gated suburb of Fox Run Hill (``the kind of place men moved with their second wives''). Diet guru Henry Adder and his gargantuan wife Evelyn are the bane of each others' existence; Molly Bracken's just had another abortion she's kept secret from her downscale husband Joey; Sarah and Kevin Lockwood have run completely through Sarah's sterling old money; and Patsy MacLaren Willis has just shot her husband, withdrawn $15,000 from their checking account, and disappeared--though not before parking her Volvo in a downtown parking lot with a pipe bomb ticking away inside. The two stories would have nothing to do with each other if it weren't for the impending show of high-flying Karla Parrish's photographs, which reunites Karla and her Vassar friend congresswoman Julianne Corbett with local alumnae Liza Verity, R.N., and Patsy MacLaren (oops), and also drags serial-killer specialist Gregor (And One to Die On, 1996) into a rash of murderous pipe bombings. Gregor's repeated teasing hints will make the solution obvious even to non-Armenian readers. The real loss, though, is all those misfit Fox Run Hill matrons, springing to life in a superbly alarming prologue and then left idling at high through most of the subsequent proceedings.