Lisbon and Cho are assigned to keep an eye on a political rally, and they discover a dead body in an alley. Time to get the CBI on the case. As the team checks out the crime scene, Jane sees a suspicious man lingering around the rally. And he's carrying a loaded firearm. The man is Henry Tibbs, who does have a concealed weapon permit. Everything about him is legal, but Jane can't shake off the feeling that this man is dangerous.
Luther Wainwright, the CBI's new boss, says not to pursue Tibbs, but Jane wants to keep an eye on him anyway. The team finds out that the victim was a photographer who was taking pictures at the rally. A homeless man admits to the crime. Lisbon recognizes the man as a famous musician whom she once loved. She doesn't think he murdered anyone.
Jane has Rigsby set up a fake job interview in order to uncover more information about Tibbs. Van Pelt speaks to Tibbs' estranged wife, who doesn't want anything to do with him. Under the guise of the job interview, Rigsby asks Tibbs some questions from a personality test, and Tibbs doesn't seem to have a psychiatric disorder.Cho keeps close watch on Tibbs as he visits a shooting range.
Wainwright wishes to stop the surveillance on Tibbs and just get him on illegal gun possession, but Jane still wants to prove the man is dodgy. Wainwright suggests that it's Jane who's the psychopath, not Tibbs. The photographer's last photos lead the team to the murderer. But there's still Tibbs to contend with.
Tibbs suddenly storms his estranged wife's workplace demanding to know where she is. Van Pelt nearly shoots him, but he doesn't have anything dangerous in his hands. Only a bouquet of flowers.
Tibbs takes off, and Jane knows exactly where he's headed. There's a garden party being held for the major. Tibbs takes out an Uzi and is ready to spray the entire area with gunfire. Jane attempts to talk to him but Tibbs attacks the party anyway. Luckily, Jane and Lisbon switched the man's ammo for blanks back when they were searching his home.