A series of murders in Manhattan seems random at first, then the police fear that a serial killer may be copying the crimes of another decades earlier.
A vigilante posts a video online of a man, previously locked up for statutory rape, being beaten and burned alive; Lindsay encounters some personal and professional problems.
Saul tries to track down those responsible for the attack on Langley; Quinn takes matters into his own hands; Carrie learns who her allies are; the Brody family starts therapy.
The team searches for a serial killer who kidnaps and hangs his victims.
Multiple murders lead detectives to a homeless schizophrenic who has been off medication for some time.