Cyrus Vanch, a nefarious criminal, is recently released from prison and intends to re-secure his position as leader of the underworld. His first step is to take down his biggest opponent in the city – Arrow. Meanwhile, Oliver shows Moira his father’s notebook and questions her about the names on the list. Thea is miserable as she starts her internship with Laurel at the legal aid office and Detective Lance makes a deadly mistake that puts Laurel in the crosshairs of Vanch.
Peter and Neal work a forgery and money laundering case that leads them into two of the most iconic New York institutions, taxi cabs and jazz.
While investigating the murder of a young woman, Castle and Beckett find evidence that links her death with Senator William H. Bracken (Jack Coleman), the man responsible for Beckett’s mother’s murder. Determined to finally bring Bracken to justice, Beckett soon realizes that things are far more complicated than they seem.
Barney uncovers the lost episode of Robin’s “Underneath the Tunes” as Robin Sparkles. Meanwhile, Marshall and Lily are concerned that Ted’s new girlfriend is a stalker.
Sherlock pursues Martin Ennis, an unpredictable criminal, before he strikes again. During the investigation, Sherlock is forced to work alongside Kathryn Drummond, the FBI profiler who literally wrote the book on Ennis. Meanwhile, Watson faces eviction from her apartment.
A botched museum heist in Harrisburg has unintended consequences, as Lucas, Carrie and Job renew their partnership. After coercing redneck henchman Arno to offer up incriminating evidence, Lucas and Emmett arrest Proctor for Hanson’s murder, but are detoured on the way to the jail.
Claire fuels an old flame. Peter wrestles with his demons. Francis crosses the point of no return.
Zoe extends her time away from The Hill while Francis tracks down Russo and engages in damage control.
The President sends Frank to St. Louis to persuade Raymond Tusk into becoming the new Vice President. Zoe and Janine investigate Peter Russo’s death.
Frank scrambles to keep his plan on track. Gillian is planning to sue Claire. Zoe, Janine, and Lucas investigate Rachel Posner and her relationship with Peter Russo.