In prison for killing his nemesis, Patrick Jane must prove that the man he shot really was Red John. Meanwhile, Lisbon urges Van Pelt to seek counseling in the aftermath of the death of her fiancé, Craig O'Laughlin.
With Lisbon suspended and the rest of the team reassigned, Jane is reinstated as a CBI consultant and forced to work with a new team. During the investigation, Jane conspires to bring his former team back together.
When the son of a former client from Jane's days as a psychic is kidnapped, Jane and the CBI team are asked to help find him. Meanwhile, Jane butts heads with his former client's new "spiritual advisor".
Jane notices a suspicious looking man carrying a gun at a political rally and sets out to prove he's a psychopath on the brink of committing murder. Meanwhile, Lisbon investigates the death of a photographer at the same rally.
Jane and the CBI team investigate the murder of a woman whose body washed up on an island off the coast of California. Meanwhile, Rigsby worries that his relationship with a public defender may create awkwardness between him and Van Pelt.
When the CBI team travels to a resort town to find out who murdered a police chief, Lisbon crosses paths with her brother Tommy, now a bounty hunter, who's tracking a bail jumper.
The search for a serial killer hits close to home for Jane when he encounters a blogger who has devoted his life to finding the killer.
In order to find the killer of an undercover narcotics cop, Jane and the CBI team retrace her investigation.
Jane and the CBI investigate when a retired NFL star quarterback is presumed dead after his car blows up. Meanwhile, while preparing for a court case, Rigsby and Sarah Harrigan take their relationship to the next level.
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.
Jane and the CBI must narrow down the long list of suspects after a high-end divorce attorney with many enemies is killed on his speed boat. Meanwhile, Jane is questioned about whether Red John was responsible for Panzer's murder.
With very little evidence, Jane and the CBI investigate the death of a mob boss' son. Meanwhile, while taking a belligerent witness in for questioning, Van Pelt is haunted by the memories of O'Laughlin's shooting.
Jane and the CBI narrow down the list of suspects after a disgraced clothing designer on the verge of a comeback becomes a fashion victim. Meanwhile, FBI Agent Darcy continues her investigation into finding Red John.
While a jury deliberates the guilt or innocence of a defendant on trial for murder, Jane tries to prove she has been wrongfully accused before time runs out. Meanwhile, Summer may have gone too far when she helps Cho make a case against a suspect.
When a charity worker is killed, Jane has Erica Flynn, a murderer he helped imprison, furloughed in exchange for information she claims to have about the case. Meanwhile, Rigsby and Sarah try to adjust to impending parenthood.
Jane is reunited with his former nemesis, cult leader Bret Stiles, when the head of an anti-cult activist organization is murdered.
Jane suspects that Susan Darcy has ulterior motives when she asks for his help with a homicide investigation. Meanwhile, the CBI team handles the murder of a young woman who was killed after meeting someone in an online chat room.
Jane and the CBI try to narrow down the list of suspects when a terminally ill man, is found murdered. Meanwhile, Cho is forced to face his demons.
While investigating the murder of a casino employee, Jane runs into a stage magician he used to tour with during his time as a mentalist and discovers he is hiding a shocking secret.
Jane and the CBI try to determine who would have reason to kill a popular English teacher, giving Jane an opportunity to show off his acting skills to a drama class. Meanwhile, Cho hides his relationship with Summer from Lisbon, and Rigsby gets a special delivery.
Jane and the CBI gang get involved in the world of a Drag Queen Cabaret when a body is found burned to death in the alley behind their theater.
While investigating the murder of a surfer, Lisbon reconnects with her former fiancé, Greg Tayback, who she hasn't seen in over a decade. Also, Cho questions his decision to be in a relationship with Summer.
On the eighth anniversary of his wife and daughter's death, Jane receives a message from Red John, causing Jane to lose focus on his current case and put the investigation and his career at the CBI in jeopardy.
After another attempt to find Red John fails, Patrick Jane hits rock bottom at a Las Vegas club in the fourth season finale.
