source: http://en.wikipedia.org/wiki/The_Mentalist_(season_4)

The Mentalist (season 4)

No. in series	No. in season	Title	Directed by	Written by	Original air date	Production code	U.S. viewers (million)
71	1	"Scarlet Ribbons"	Charles Beeson	Bruno Heller	September 22, 2011	3X6801	13.56[4]
After being imprisoned and charged with murder, Patrick Jane has to defend himself in court and investigate mysteries associated with Red John. Meanwhile, Lisbon is trying to persuade Van Pelt to seek counseling in the aftermath of her fiancé's unexpected demise. After some investigating, Patrick finds out the wife of the man he killed is hiding some secrets. At the end, Jane admits to Lisbon that he knew that the man he killed is not Red John.
72	2	"Little Red Book"	Eric Laneuville	Tom Szentgyorgyi	September 29, 2011	3X6802	12.92[5]
The CBI has a new supervising agent, Ray Haffner, while Patrick Jane is trying to get his team back together by manipulating with Haffner's team.
73	3	"Pretty Red Balloon"	John F. Showalter	Ashley Gable	October 6, 2011	3X6803	13.15[6]
Jane and the CBI team are assigned a kidnapping case, the victim being the son of a former client from Jane's days as a psychic. Meanwhile, Jane encounters his former client's new "spiritual advisor".
74	4	"Ring Around the Rosie"	Chris Long	Daniel Cerone	October 13, 2011	3X6804	12.39[7]
While Lisbon looks into the death of a photographer at a political rally, Jane has his sights set on proving a man carrying a gun at the same rally is a psychopath with murder on his mind.
75	5	"Blood and Sand"	John Polson	Eoghan Mahony	October 20, 2011	3X6805	12.54[8]
An island off the coast of California holds clues to a murdered woman. Rigsby worries that because he has a new girlfriend, Van Pelt will feel uncomfortable around him.
76	6	"Where in the World Is Carmine O'Brien?"	Bobby Roth	David Appelbaum	October 27, 2011	3X6806	12.42[9]
While trying to solve the murder of a police chief Lisbon runs into her brother Tommy, a bounty hunter, who's tracking a bail jumper.
77	7	"Blinking Red Light"	Simon Baker	Ken Woodruff	November 3, 2011	3X6807	13.66[10]
The CBI team is trying to find a serial killer while Jane encounters a blogger who has devoted his life to finding the killer.
78	8	"Pink Tops"	Tom Verica	Erika Green Swafford	November 17, 2011	3X6808	12.21[11]
When an undercover narcotics cop is found dead, Jane and the CBI retrace her investigation to find the killer.
79	9	"The Redshirt"	Eric Laneuville	Jordan Harper	December 8, 2011	3X6809	13.04[12]
Jane and the CBI investigate a car explosion, which involves an NFL quarterback. Meanwhile, Rigsby and Harrigan take their relationship to the next level.
80	10	"Fugue in Red"	Randy Zisk	Daniel Cerone	December 15, 2011	3X6810	13.16[13]
Jane almost drowns while investigating the murder of a fireman and loses his memory, turning him into the old con man Patrick Jane.
81	11	"Always Bet on Red"	John F. Showalter	Ashley Gable	January 12, 2012	3X6811	13.65[14]
Jane and the CBI team investigate the murder of a high-end divorce attorney, with many enemies, after he is killed on his speed boat. Meanwhile, Agent Darcy questions Jane about Red John's involvement in Panzer's murder.
82	12	"My Bloody Valentine"	Elodie Keene	Tom Szentgyorgyi	January 19, 2012	3X6812	14.22[15]
Jane and the team try to investigate the death of a mob boss's son, despite having very little evidence; memories of O'Laughlin's shooting haunt Van Pelt.
83	13	"Red is the New Black"	Tom Verica	Eoghan Mahony	February 2, 2012	3X6813	13.87[16]
The CBI team must determine who killed a disgraced clothing designer who was on the verge of a comeback. FBI Agent Darcy hasn't finished with her investigation into Red John.
84	14	"At First Blush"	Roxann Dawson	David Appelbaum	February 9, 2012	3X6814	14.68[17]
While the jury deliberates, Jane tries to prove a woman charged with murder is innocent. While helping Cho with a case, Summer may have gone too far.
85	15	"War of the Roses"	Geary McLeod	Ken Woodruff	February 16, 2012	3X6815	13.55[18]
When Erica Flynn, whom Jane helped convict of manslaughter, claims to have information about the death of a charity worker, Jane has her furloughed in exchange for that information.
86	16	"His Thoughts Were Red Thoughts"	Charles Beeson	Jordan Harper	February 23, 2012	3X6816	13.36[19]
When an anti-cult activist is murdered, Jane must determine if cult leader Bret Stiles is responsible.
87	17	"Cheap Burgundy"	Bruno Heller	Bruno Heller	March 8, 2012	3X6817	13.84[20]
Jane goes along with Agent Darcy's request for his help even though he suspects she's intentionally keeping something concealed. After a woman is murdered following a meeting with someone in an online chat room, the CBI steps in to investigate.
88	18	"Ruddy Cheeks"	Eric Laneuville	Erika Green Swafford	March 8, 2012[n 1]	3X6818	11.83[21]
The murder of a wealthy salesman with terminal cancer is investigated by the CBI. Cho must confront things that he's been trying hard to avoid.
89	19	"Pink Champagne on Ice"	David Von Ancken	Eoghan Mahony	March 29, 2012	3X6819	13.62[22]
Jane runs into a stage magician from his tour days while he and the CBI are investigating the murder of a casino employee.
90	20	"Something's Rotten in Redmund"	Guy Ferland	Rebecca Perry Cutter	April 5, 2012	3X6820	12.59[23]
While Cho and Summer hide their relationship, Jane and the CBI try to determine who killed a popular English teacher. Rigsby nervously awaits the birth of his child.
91	21	"Ruby Slippers"	Kevin Hooks	Daniel Cerone	April 26, 2012	3X6821	12.03[24]
The CBI investigate the death of a young man found outside a cabaret and who was bullied by everyone on their suspect list.
92	22	"So Long, and Thanks for All the Red Snapper"	Chris Long	Ashley Gable	May 3, 2012	3X6822	12.94[25]
The investigation into the death of a surfer reunites Lisbon with her former fiancé. Cho is beginning to question why he's with Summer.
93	23	"Red Rover, Red Rover"	John F. Showalter	Tom Szentgyorgyi	May 10, 2012	3X6823	12.62[26]
Patrick gets contacted by Red John asking him whether he is giving up. Jane commemorates his wife and daughter's death by drinking heavily, and burns all his Red John files thinking of really giving up. Lisbon gets to know all this and is afraid of Patrick being distracted while trying to solve a murder.
94	24	"The Crimson Hat"	Chris Long	Bruno Heller	May 17, 2012	3X6824	13.09[27]
Jane attempts to catch Red John by deceiving the CBI and trapping him. After it turns out that he was not in the car that was trapped, Jane is left with a witness of Red John unwilling to speak. Supervising Agent Luther Wainwright is killed.