Bill Peterson heads to Rio Bravo, Mexico and digs up the body of the drug cartel commander whom Abbott shot and killed. He digs the bullet out of the skull and plans to use it to take down Abbott and destroy Lena's career.
Jane and Lisbon believe Peterson is skimming money during DEA raids. Cho has Vega tail Peterson. She sees him deliver the bullet to Rep. Jules Blatt's office. He wants to block Lena's appointment.
Jane, Lisbon and Cho break into Peterson's home to look for the money they suspect he's hiding. They find his safe but they need his thumb print to open it. Jane has Wiley (who asks Abbott) to pull together at least a million dollars in cash.
Jane meets up with Pete from his carnie days to ask for his help pulling off a con to save Abbott. He also tells him he's dating Lisbon. Pete is happy for him and notices he's still wearing his wedding ring. He tells Jane that Angela would want him to move on and be happy.
Vega rams her car into Peterson's to try and stall him from returning home but he realizes that she's part of Abbott's team and leaves, but doesn't make it home in time to catch Jane, Lisbon and Cho.
Peterson turns up to testify at Lena's confirmation hearing but Abbott stops him. They have pictures of Peterson's cat sitting on piles of cash and tell him they found the money he's been skimming for years. Peterson tells Abbott he'll split it with him if he'll walk away. When Abbott turns him down, he realizes that Vega has been recording him.
Peterson tells Abbott it doesn't matter because he's already delivered the bullet used to kill the cartel commander to Rep. Blatt's office. Little did he know he delivered it to one of Jane's carnie friends, Pete and Samantha, not Blatt's associate.
The team celebrate's and Abbott tells Cho he's going to move to D.C. with Lena and take a position there. Cho is being promoted to take over Abbott's role. Everyone is thrilled. Wiley and Vega dance. Jane admits to Lisbon that he's terrified of losing her. Lisbon says that either one of them could die tomorrow but that right now things are very, very good and they should enjoy it. Then they dance.