As Maggie and the team search for New York's latest serial killer, the copycat method used by the murderer forces Maggie to seek help from Ray Distefano, the serial slasher she put behind bars.

When a famous rapper and two teen fans are gunned down on his tour bus, the team discovers there may be more to the story than his feud with another rapper; Isobel hits a major milestone that has her contemplating her future at the Bureau