Andy and John key in on a suspected serial rapist after a woman escapes an attack at one of the bars their perp seems to be targeting. But when that leads to a dead-end, the squad is forced to re-evaluate the investigation. Meanwhile, a cop's big secret keeps Baldwin and Greg from closing a case; Diane reaches out to Connie on the day of her biopsy; and good luck finally visits the Sipowicz home. Diane: Kim Delaney. Lucy: Tina Holmes. Lyle: Sonny Marinelli.