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.

Peter and Neal pose as wealthy bachelors to catch a black widow.

Neal goes undercover in an attempt to capture a wanted fugitive; Keller confesses his motive for returning to New York.

Peter tries to find Neal on a remote island before a bounty hunter locates him first.

Peter comes up with a strategy to return Neal to the U.S. before Collins catches him.

A criminal with a vendetta against Peter hires a political fixer to sabotage the trial.

Peter and Neal attempt to find the truth behind Neal's father's crime. In doing so, Neal must go undercover into the world of counterfeit whiskey to take down a high-level member of the Irish Mob.

Peter and Neal focus on a case dealing with someone from Mozzie's past.