After figuring out the last clues of the Mosconi Code, Neal and Peter try to find the Diamond before somebody else can get to it first.
When Neal and Peter realize that a client trying to reach Rebecca hasn't seen her before, they interrupt Diana's maternity leave and ask her to pose as Rebecca in order to expose the client, a corrupt stock trader. Meanwhile, Rebecca offers necessary information in exchange for seeing Neal and Mozzie figures out how to solve the last of Mosconi clues.moreless
After learning Rebecca lied to him, Neal finally tells Peter about the Mosconi Codex, resolving the tension between them. Peter realizes Rebecca has developed real feelings for Neal and tries to use it to their advantage to lure her into a trap, but she can escape. Unwilling to put Neal's life at risk again, Peter asks Neal to step back. However, with Rebecca still holding Hagen's blackmail tape, Neal sets out on his own to get to her first.moreless
Cat and Vincent wonder if Alex can be trusted to keep the secret of Vincent's past. Evan discovers that Claire, the woman he is dating, has been keeping secrets from him. Heather meets Joe's younger brother, Darius, and develops feelings for him. Vincent tries to win over Cat with romantic gestures for Valentine's Day.moreless
Cat starts to believe that Muirfield might have tracked down Vincent, and despite her promise to avoid seeing him, Cat has to interrupt his romantic cabin getaway with Alex to protect them. Meanwhile, Evan finds a bug in his lab, which makes him start to believe J.T.'s warnings about the dangers of his research.moreless
Vincent struggles to sort out his feelings for Cat and the memories from his old life with Alex. After J.T. discovers that Evan is planning to recommend that NYPD form a task force to catch the beast, he tries to figure out how to stop Evan. Meanwhile, Tess works on a case involving the mysterious skydiving death of the wife of a billionaire adventurer, while Cat remains off-duty as she recuperates from her gunshot wound.moreless
Vincent narrowly escapes being caught by his former fiancée, Alex, and has to face the fallout of his past. While Cat recovers in the hospital, she deals with her feelings for Vincent. Meanwhile, J.T. receives an unexpected visit from someone interested in his past research on mutant DNA.moreless
New evidence found online has Moretti seeing Pierce's conspiracy theory in a new light. Pierce's new doctor presses him to face the truth about Natalie. (Part 2 of 2)
When a former student tells Pierce about a potential conspiracy regarding a U.S. senator's death, things soon spiral out of control. Pierce may not be able to trust those around him. (Part 1 of 2)moreless
Reese and Finch go into overtime when the Machine gives them the numbers of four Persons of Interest. Meanwhile, Carter deals with the aftermath of the recent assassination attempt on her, and Reese's past resurfaces.moreless
After a cyber attack on the DOD, NCIS and the NSA team up to locate the person responsible. Callen continues to look for information regarding his past.