During the search for a firefighter's killer, Jane is attacked and nearly drowned, resulting in a temporary loss of his memory and a return to his pre-CBI con man persona.

While Jane tries to decipher Lorelei’s connection to Red John, the CBI team is forced to partner with the FBI to solve the murder of a hotel employee.

While the team investigates the murder of a diamond cutter, Jane meets a girl who claims to be his late daughter, Charlotte.

The CBI investigates the death of a geologist, which Lisbon is convinced is the key to bringing down Tommy Volker.

The team delves into the surprisingly cutthroat world of academics in a case involving a graduate student at a natural history museum.

Jane gets the CBI involved in a case in Napa in order to focus on Sheriff McAllister, while Van Pelt and Rigsby take a trip down the aisle.

Jane's investigation leads him to join a separatist commune after a U.S. attorney is found dead in Mexico, even though there's no record of her crossing the border. Also, Rigsby and Van Pelt convince J.J. LaRoche to help them discover who is stalking former CBI members.

With time running out to save the victims of a kidnapping ring before they are transported overseas, Jane and Lisbon zero in on the criminal enterprise’s mastermind. Meanwhile, Lisbon decides if she will move to D.C. with Agent Pike.