Jack and the team look for a paparazzo after he vanishes from a celebrity shoot, and his camera is found covered in blood.

Jack and the team search for Joe Gibson, who disappeared after a chase and gunfight with unidentified figures.

After Dave Mendoza is injured in a drive-by, Ben takes is upon himself to solve the case -- much to Sammy's dismay.

Det. Mendoza asks the team to probe murders.

Alec Mercer, a world-renowned professor of behavioral science, lends his expertise to an array of high-stakes cases with his unique and unexpected approach to understanding human behavior.

New partners Murtaugh and Cole attempt to find a steady rhythm as they work to solve the murder of a finance executive. Meanwhile, Cole navigates his role with his ex, Natalie, and his daughter, Maya, and Avery grapples with the outcome of his campaign for city council.

Patrick and the CBI team investigate the murder of a tutor, and find a mysterious little red box near the body, starting a chain of events that turns the murder into the search for a priceless ring stolen from the British Museum.

After Dave Mendoza is injured in a drive-by, Ben takes is upon himself to solve the case -- much to Sammy's dismay.

After a narcotics officer is shot in the back, Brady returns to her old precinct to investigate the murder; when the suspect's story doesn't add up, she enlists Shaw and Riley to discover the truth.

Det. Mendoza asks the team to probe murders.

New partners Murtaugh and Cole attempt to find a steady rhythm as they work to solve the murder of a finance executive. Meanwhile, Cole navigates his role with his ex, Natalie, and his daughter, Maya, and Avery grapples with the outcome of his campaign for city council.

Patrick and the CBI team investigate the murder of a tutor, and find a mysterious little red box near the body, starting a chain of events that turns the murder into the search for a priceless ring stolen from the British Museum.

After Dave Mendoza is injured in a drive-by, Ben takes is upon himself to solve the case -- much to Sammy's dismay.

When Luke disappears after an uplifting speech at his high school reunion, Jack and the team find Luke's blood at the location of his disappearance.

Jack and the team look for a paparazzo after he vanishes from a celebrity shoot, and his camera is found covered in blood.

Jack and the team search for Joe Gibson, who disappeared after a chase and gunfight with unidentified figures.

Det. Mendoza asks the team to probe murders.

After a narcotics officer is shot in the back, Brady returns to her old precinct to investigate the murder; when the suspect's story doesn't add up, she enlists Shaw and Riley to discover the truth.

Patrick and the CBI team investigate the murder of a tutor, and find a mysterious little red box near the body, starting a chain of events that turns the murder into the search for a priceless ring stolen from the British Museum.

After Dave Mendoza is injured in a drive-by, Ben takes is upon himself to solve the case -- much to Sammy's dismay.

Someone is murdered during a phone call with Sgt. Gabriel.

Bruno must get to the center of a victim's incomplete story to track down a serial rapist; Carisi is helpless to stop a crime he suspects is about to be committed.

Carisi tries to protect two women taken hostage in a tense standoff between police and a violent thief. Benson and Rollins devise a risky plan to get everyone to safety.

Cormack investigates the link between Ezekiel's missing cousins and Isabel's murder. He probes Joe about his connection to Ezekiel, but Joe refuses to cooperate. Billy Hopkins claims to have evidence implicating Steve Walcott.

Alec Mercer, a world-renowned professor of behavioral science, lends his expertise to an array of high-stakes cases with his unique and unexpected approach to understanding human behavior.

When a "Jane Doe" with amnesia and covered in blood steps in front of Cho and Van Pelt's car, Patrick Jane must use all of his skills to discover who she is, her last location and why she lost her memory