When "The Mentalist" returns, Patrick Jane will work his charm on a new lady, but Agent Kim Fischer may try to thwart his intentions. 

In an exclusive preview from Sunday's episode, called "White Lines," the FBI will be tasked with finding the person who killed several DEA agents. During the investigation, they cross paths with a businesswoman named Krystal Markham ("Devious Maids'" Brianna Brown). Krystal does not have a lot of useful information as it pertains to the investigation, but that doesn't stop Jane (Simon Baker) from asking for her number for a non-work related reason. 

Go here to see the exclusive clip. 

Before the show's winter hiatus, Jane finally got back to investigating. 

In the last episode, "Green Thumb," Jane is in isolated detention for three months, and Abbott (Rockmond Dunbar) and Fisher (Emily Swallow) want him to finally cave and join the FBI. He won't do it unless Lisbon (Robin Tunney) comes aboard. Fisher goes to Washington to convince Lisbon to come work for them. 

Lisbon goes back with Fisher to hear Jane make his case. She refuses, but stays for a little while longer. The FBI then finally gets Jane to help on the case of a man who was reported missing in Brooklyn. 

Although Jane has been away from the profession for years, it's as if he never left. He figures out that the missing man caught his wife's psychic breaking into their home, and accidentally killed him during the struggle. He was then caught by a neighbor when he was trying to bury the body. The neighbor--who is a former gang member--decides to hold the man for ransom, knowing that he would soon be tracked down by police.

During the investigation, Fisher's straight-laced ways clash with Jane's style, and she gets so fed up with him that she threatens to charge him with the murder of Red John. But she reconsiders when he tells her where she can find the dead psychic's body. 

On the way back to Texas, Lisbon tells Jane that she's ready to move on, and doesn't want to work with him or rekindle their relationship. 

Yet, a ploy by Jane ends up changing her mind. While in Brooklyn, Jane sends a letter to Abbott, and it's revealed that the letter is really a list of all the members of the Blake Association, which he claims to have gotten off a hard drive Rigsby (Owain Yeoman) and Van Pelt (Amanda Righetti) found in Bertram's wine cellar. Some of the names are blacked out, and Jane says he will only divulge the names when his contract with the FBI ends. Abbott agrees. 

It's later revealed that they never cracked the code on the hard drive, and Jane made up the list. Once he tells Lisbon, she agrees to come back and work with Jane. 

"White Lines" airs Sunday, Jan. 5 at 10 p.m. on CBS.