Sorenson's sister, Lori comes to town and spends the day in the city trying to hook up with him. However, he and Sipowicz are investigating the murder of a nine-year-old girl who was found murdered in the basement of the building where she lived. The building's superintendent is only interested in getting his tools back. Sipowicz and Sorenson find the tools in the possession of a tenant of the building who has his own passageway into the basement. Meanwhile, Medavoy and Martinez investigate the case of an elderly man who comes to the precinct claiming he's been embezzled by his young girlfriend through influence by a friend of hers. The detectives debate about how to tell the old man about the nature of "girl" who's been giving him great pleasure. Dolores Mayo's long estranged father comes looking to visit her, Diane and Jill give him the news of her death.