The investigation into a girl’s disappearance leads to a high-tech kidnapper who uses the Internet to cover his tracks; Rollins reconnects with her sister.

When a teenager’s body is uncovered in the Hudson River, the detectives search for the victim’s identity which leads Benson to go undercover as a madam.

An anonymous tip leads the team to investigate an urgent death row case, ultimately sending Zapata undercover. After nearly getting caught during the mole hunt, Jane considers leaving the FBI.

A serial killer from Liz’s past strikes again while Red hunts for whoever betrayed him.