When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub which has a puzzling past.
McDowell and Sipowicz investigate Frank Colahan's parents to keep them from getting custody of the baby; someone attacks Haywood in her apartment building.
A small-time band promoter is found dead; mail-order brides fall victim to violence; Haywood worries a released felon is after her.
The grandparents of Connie's sister's baby vow to gain custody; Sipowicz investigates the murder of a man involved with a fraud ring.