An investigation into the death of a judge's daughter leads Dr. Lightman to the girl's prep school, while Dr. Foster investigates a NASA pilot who crashed on a test flight.

A violent storm traps Harry, Fergus and Lola in the local pub; cut off from the outside world, the trio are put in even more peril when they discover a kidnap victim in a car.

When a wealthy matriarch is strangled to death during a video call with her relatives, the woman's daughter employs the services of the Wild/Reid Detective Agency.

Zoe McCann is a recovering addict fighting each day to slay her demons; when she is abducted only to wake up in a forest wearing a vintage ballgown, her sanity and resolve are pushed to the limit.

Chase snoops around PRIDE hoping to discover their dark secrets and struggles with his betrayal of the Runaways. What happens to Karolina when she realizes who/what she really is?

PRIDE makes an offer to the Runaways: surrender or lose. Separated and scared, the kids try to survive at all costs with the fate of Pride and the Runaways hanging in the balance

A Congressman who's friends with Voight is found with a dead Ukrainian girl.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it. Meanwhile, Voight discovers who's been leaking information from the 21st.

Halstead's partying with Camila unintentionally puts him in the middle of a drug-related homicide. He's forced to choose between loyalty to his unit and his girl. Meanwhile, Voight finally discovers the mole in his unit.

Monk deals with leprosy on two fronts as he's called to testify that a leper is indeed alive so that his money isn't given away.

When Monk suddenly acquires a new friend who rarely leaves his side, everyone is suspicious but him.

Dex is confronted with unresolved feelings from her past when she is hired by Sue Lynn to investigate a case with the widow of Dex's former flame. Meanwhile, Dex and Grey's friendship is put to the test by his new romance with Liz.

Dex goes undercover as a high school substitute teacher after an old classmate of hers enlists her help to find out who planted drugs on her daughter. Meanwhile, Dex and Liz's relationship gets too close for comfort.

Dex is hired by a famous TV judge to help find his prodigal brother but soon finds that she is not the only one looking for him; Hoffman enlists Grey's help to track down a stolen car.

Riggs and Murtaugh are thrown into the world of counterfeit money. When a group of teenagers inadvertently gets involved, it strikes a chord with Murtaugh, who is dealing with his own issues regarding his son, RJ. Meanwhile, Riggs decides to pay a visit to someone from his past.

A secret about Riggs' deceased wife is revealed when he visits his father-in-law in prison.

A father and his two children are missing from their home, and the team soon suspects that it may be related to marital issues. Meanwhile, Rusty has an urgent question for Provenza.

A man out on parole claims he did not commit the murder that sent him to prison, but he is killed himself soon afterwards. Meanwhile, Sharon has a meeting with Rusty's mother.

Amateur detective "Dick Tracy" returns to help Major Crimes investigate the death of a dog who inherited his deceased millionaire owner's fortune, and Rusty offers to get a job to help his mom.

The Lie to Me gang attends a high profile wedding where the father of the groom, a Korean ambassador, has been getting death threats.

The gang tackles two cases--the suspicious death of a firefighter and the parole of a former gang leader.

The investigation goes back to the casino; tension erupts at the Larsen house; Stan meets Richmond face to face.

Sarah tries to find Holder; Stan takes matters into his own hands; Richmond returns to City Hall.

Richmond helps the investigation; Sarah looks for Rosie's key; Stan's son is in trouble; Mitch gets to her destination.

Dex goes undercover as a high school substitute teacher after an old classmate of hers enlists her help to find out who planted drugs on her daughter. Meanwhile, Dex and Liz's relationship gets too close for comfort.

Dex is hired by a famous TV judge to help find his prodigal brother but soon finds that she is not the only one looking for him; Hoffman enlists Grey's help to track down a stolen car.

Murtaugh's Christmas vacation in Hawaii is put on hold when he and Riggs are called to a homicide and the victim is an old friend.

Riggs and Murtaugh are thrown into the world of counterfeit money. When a group of teenagers inadvertently gets involved, it strikes a chord with Murtaugh, who is dealing with his own issues regarding his son, RJ. Meanwhile, Riggs decides to pay a visit to someone from his past.

A secret about Riggs' deceased wife is revealed when he visits his father-in-law in prison.