Jane and Lisbon decide to keep their new relationship a secret from their colleagues as they investigate the murder of an undercover agent. Also, young, ambitious agent Michelle Vega joins the team.
Jane and Lisbon travel to Beirut where they must work with Jane's familiar adversary, Erica Flynn, who agrees to help the FBI apprehend her boyfriend, a courier for terrorist organizations, in exchange for amnesty for her past crimes.
In order to find a group of jewel thieves, Lisbon must channel her inner Patrick, who is too sick to investigate. Meanwhile, Abbott discovers that his past actions could cost his wife a promotion in Washington, D.C.
Abbott's old colleague from the DEA asks for help to find out who got one of his agents killed, but he then tries to blackmail Abbott so that he can take all of the credit.
Lisbon and Jane go to Chicago to find Lisbon's younger brother when they find out that the Feds are looking for him because he is a potential witness in a murder.
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.
Agent Peterson plans to use the information he has against Abbott to block his wife's nomination, so Patrick and the rest of the unit launches a plan to save him.
A "psychic" comes forward offering assistance in solving a double homicide. The team needs Patrick's expertise in the situation, but he has disappeared while coping with his subsequent fears for Lisbon's safety.
Patrick and Teresa decide to get married, but they are completely unaware that the serial killer "Lazarus" is still alive and plans to crash the wedding.
