In the fourth-season opener, Jane is in prison and must prove that the man he killed was Red John; and Lisbon wants Van Pelt to get counseling for having to shoot her fiancé when it was discovered that he was Red John's inside man.
A woman's body is found on an island off the California coast, and the team questions an odd group assembled on the island. Meanwhile, Rigsby dates a public defender and worries that this will make things between him and Grace awkward.
Jane and the CBI investigate the death of a man whose charred body is found outside a cabaret where female impersonators perform. Among the top suspects: a list of people who had been bullying the victim.
Jane receives a message from Red John on the eighth anniversary of the deaths of his wife and daughter. Jane then gets distracted from the CBI's latest case, an investigation into the homicide of a brokerage-firm employee.
In the fourth-season finale, Jane deals with his latest loss to Red John by hitting rock bottom in Las Vegas and hooking up with a cocktail waitress. Meanwhile, the CBI tries to solve a John Doe's homicide.