Neal and Peter go undercover to take down a corrupt group of Wall Street brokers. If the mission fails, Neal's deal with the FBI could be negated.

When the daughter of a man Neal once robbed, is kidnapped and the kidnapper is a man whom Neal worked with and betrayed, will only deal with Neal. So the FBI agent in charge of the kidnapping takes possession of Neal and sends him to meet with the man. When Peter talks to the father, he realizes that the man wants Neal but before he could warn him, he's grabbed. He wants Neal to help pull a job. Peter tries to find him. Neal gets word to Mozzie what he's been doing who tells Peter who figures out what the man is doing.

Manhattan is the latest branch of a bank to receive the calling card of the Architect, a master robber who got away with three earlier, similarly bloodless hold-ups. Peter sort of clears himself and gets jailed Neal his ankle device parole back, but on a trial basis for both of them. Neal proves the security insufficient and works out the likely identity of the Architect, squeaky clean but bored and arrogant wall Street mogul Edward Walker. Catching him proves harder, his easily seduced secretary and an inside accomplice the keys. Meanwhile Mozzie helps Burke keep track of Neal's mental recovery and discovers the mysterious music-box's disappearance from evidence.