Peter must locate Neal on a tropical island before an FBI-sanctioned bounty hunter does.
Peter must devise a plan to return Neal to New York and avoid Collins.
Neal, Peter, and Mozzie track down a sly thief long sought by the FBI.
When Neal and Peter go undercover to investigate a beautiful widow about to receive a huge life insurance payment, things become complicated when Neal begins to develop feelings for her.
Unbeknownst to Peter, Neal assist an art thief in stealing a valuable painting in exchange for information about his past.
Mozzie discovers clues to a treasure he is convinced were left by a spy ring.
A political fixer attempts to undermine the trial of a criminal Peter wants behind bars.
The team investigates a series of museum heists where ancient artifacts were the target.
Neal has to resume his Wall Street alias to apply for a broker position in the investment firm of slick 'friend' Eric Dunham, who is suspected of systematic insider trading. That requires tipping him off and entering the inner circle, an after-hours boxing club, where only the winning fighters share in the valuable secrets. Peter insists to enter and win, but Neal is in no mood to help him after finding out Peter's suspicion scared off Sam Phelps, the undercover cop who promised Neal to tell what happened to his absent cop father.
Despite their bitter row over Sam Phelps, Neal accepts to keep collaborating professionally with Peter, even appearing together as 'model team' agent-informer at agent Walt Furlong's international law enforcement convention. Together, they counter Ted Anderson's presumed evil plans at Dr. Drugov's presentation of a revolutionary new bullet proof vest. While Mozzie helps Neal contacting Sam again, Burke's men discover he stole that identity or as Neal presumes staged his death, but a killer is also on Phelp's trail.
Neal, Peter, and Mozzie take down the Irish mob's whiskey counterfeiting ring, and Neal learns more about his father's past.
Neal and Peter investigate Senator Pratt's involvement with corrupt cops, which leads to a real estate developer running a kickback scheme.
Neal and Peter investigate Mozzie's claims of taxi cab forgery and money laundering. Which leads to back to a jazz club owner.
Peter and Elizabeth are kidnapped by a young couple on a romantic crime spree. Meanwhile Neal tries to plot where the couple will strike next.
Neal goes undercover as sculpture forger in order to help the FBI arrest an art forger. Also Neal and Mozzie narrow down the location of the evidence box.
In the Season 4 finale, the guys are almost able to retrieve the evidence box from the Empire State Building, but their efforts are impeded by Senator Pratt, who hired FBI agents to find the box first.
