Danny believes a serial killer is on the loose when two separate murder victims are identified as members of a group charged with a gang rape. Meanwhile, Erin’s ex-husband, attorney Jack Boyle, resurfaces in her life as they face off in court.
After investigating a grisly murder, clues lead Nick and Hank to a seemingly unstable father who is on the run with his daughter. As they learn more about the case they realize that the girl’s father may be the least of their worries. At the spice shop, Monroe finds out filling in for Rosalee isn’t as simple as he’d hoped it would be. Meanwhile, Captain Renard finds himself paying unwarranted attention to more than one woman from his past.
Audrey and Nathan investigate a series of strange incidents where the only common factor is a missing woman. Meanwhile, Duke insists on tailing along on the officers' investigation, while the Teagues do some digging on Tommy's background.
Stephen Fry asks for 'quite interesting' facts about places which start with the letter J. With Susan Calman, Sandi Toksvig, Bill Bailey, and Alan Davies.
In order to stop Knox, Scott comes to Bryant for assistance. Meanwhile Stonebridge has trouble focusing on the mission as he is bent on revenge. Section 20 get assistance from South African police to stop Knox's plot.