Neal goes undercover as a political "fixer" in order to bring down a corrupt politician. Diana and Peter's lead brings them to an unidentified man who escapes their pursuit. It is also revealed that Peter had Diana keep the music box's location hidden even from Peter himself. Neal begins to suspect that Peter is investigating the plane explosion behind his back.

Peter sends Neal back to school after someone copycats one of his old schemes. Alex returns with some bad news. Diana discovers the music box is hiding something. Peter and Diana set out to find the missing key, which is the last piece of the music box that Alex gives Neal before leaving for Italy. Aidan Quinn guest stars as a criminology professor.

When Mozzie believes someone he cares about has been kidnapped, he turns to Peter and Neal for help.

In order to save the life of an insurance investigator named Sara Ellis, Neal and Peter have to find out why a real-estate mogul put a price on her head.

The arrest of a jewel thief leads Peter and Neal toward a much more heinous extortion case against adoptive parents.

An FBI Agent is accused of selling witness locations during criminal trials, and the U.S. Marshals ask Peter and Neal for help tracking down the suspect. But when Peter uncovers the truth behind the plot, he must dive into the world of exotic cars and go on the run with his fellow agent until he can prove the man's innocence.

Neal and Peter must go undercover into the world of corporate espionage after a tech company's head researcher is murdered.

Neal orchestrates an elaborate con to bring himself face to face with Kate's murderer.

Mozzie narrowly escapes death and Neal uses his contacts to help Peter find Mozzie's shooter Julian Larssen. However, Larssen manages to blame Peter instead and is released. Suspended from the FBI, Peter enlists the help of Neal, Jones, Diana, Sara, Mozzie and even Elizabeth to run a sting to finally catch Larssen and to clear his name.

Peter goes back to the time he arrested Neal for the first time. In the meantime, Neal remembers meeting Kate and Mozzie.

Peter and Neal work to free a diplomat's son, who has been taken into custody in Burma for a crime he didn't commit. The case requires the duo to use diplomatic laws to their advantage in order to overcome the obstacles facing them.

Neal is suspicious when an old friend of June's husband is released from jail and shows up for a visit.

Matthew Keller, Neal's imprisoned rival, contacts Neal and Peter to make a deal. However, the two have to realize Keller set them up to kidnap Peter and to force Neal to bargain with Jason Lang, Keller's former partner turned adversary.

Peter and Neal assume each other's identities to uncover a collusion scheme.

Neal gets closer to finding out the truth about Kate's death.