 A six-year-old girl critically injured (and subsequently dies) in an apparent robbery gone bad tests positive for a sexually transmitted disease, putting the detectives on the trail of the family, then the store clerk, and the son of a prominent attorney who had appeared to foil the crime. When evidence turns up that the little girl s older sister was dating the alleged sexual predator, Cabot has to work some legal magic to eradicate the deal made with the older sister for testimony.