Jane and Lisbon are a few weeks into their new relationship when they investigate the murder of an undercover agent. However, they decide to keep their relationship a secret from their colleagues, including the young, ambitious agent Michelle Vega who's joined the team.
Lisbon goes undercover as a prison inmate in order to get a convict to turn on her boyfriend who is the leader of the high-end car theft ring.
Jane and Lisbon travel on a dangerous mission in Beirut where they must work with a familiar adversary, femme fatale Erica Flynn, who agrees to help the FBI apprehend her boyfriend, a courier for terrorist organisations, in exchange for amnesty for past crimes.
The team investigates a murder linked to a counterfeit diamond operation but illness forces Jane to steer the case from the office as he recuperates. Meanwhile, Abbott is concerned that past transgressions could harm is wife's chance to obtain a job in Washington D.C.
A chance encounter with a military colonel leads Jane to believe the officer is hiding something, prompting him to dig into the closed murder case of the man's wife.
The FBI is brought in to consult on a botched DEA raid, but when Abbott's former boss tries to blackmail him into keeping the agency's missteps quiet, Abbott is forced to choose between his career and his morals.
A murder investigation becomes personal for Lisbon when she learns that her underachieving, younger brother Jimmy is being sought as a key witness.
Jane worries for Lisbon's safety when the team puts itself in the line of fire to protect the witness in a murder investigation from a skilled assassin.
When Abbott's old boss, Agent Peterson, threatens Abbott's career - and possibly his freedom - Jane devises a risky plan to protect his friend's future.
Jane takes extreme measures as the FBI team tries to apprehend a deadly gang of armoured car robbers before their desperation to remain free costs more innocent people their lives.
A young man claiming to have psychic powers offers his help to the FBI in solving a pair of murders, but when he leads them to additional victims, Jane begins to suspect that he is in fact the cunning killer they're hunting.
Jane agrees to pretend once again to be a renowned psychic and be used as bait, in an attempt to lure out a serial killer and give the FBI a chance to apprehend him.
Lisbon accepts Jane's surprise marriage proposal, but a killer's quest for revenge may cost them the happy ending they've worked so hard to achieve.