Cole is investigated by the FBI, forcing Murtaugh to question his loyalty to his own partner; Cole works a case that puts Natalie's fiance into the cross-hairs right before their wedding day.

Scholarship student Derek is accused of killing his principal. Harry goes undercover at St Barts to find who framed him, uncovering disturbing darkness at the school.

When the kids discover that Topher may be more dangerous than they could have imagined, will they help him or will they turn their backs on their new friend?

A boxer narrowly avoids a bomb, and Stottlemeyer believes it won't be the only attempt with a championship bout coming up. Meantime, Monk splits his time between the case and contemplating retirement when he finds he must pass a fitness exam.

Cole is investigated by the FBI, forcing Murtaugh to question his loyalty to his own partner; Cole works a case that puts Natalie's fiance into the cross-hairs right before their wedding day.

Reese and Finch puzzle over how a six-month-old baby could be their next person of interest, but consequently resort to overprotective parenting with an arsenal at their disposal.

The viral video of a fatally stabbed man leads to the discovery of several other bodies by a screwdriver serial killer. Gustavo wants help finding his surviving sister but remains guarded against giving out much information.

Atwater goes undercover to bring down the longtime head of a criminal enterprise and becomes entangled in a situation that tests his allegiances as well as his conscience.

The Lightman Group discovers that a governor's staffer who was killed during a rally right before the election may have been the target all along to protect a cover-up, and Clara might be lying to protect somebody on the inside.

Scholarship student Derek is accused of killing his principal. Harry goes undercover at St Barts to find who framed him, uncovering disturbing darkness at the school.

Reese and Finch puzzle over how a six-month-old baby could be their next person of interest, but consequently resort to overprotective parenting with an arsenal at their disposal.

A boxer narrowly avoids a bomb, and Stottlemeyer believes it won't be the only attempt with a championship bout coming up. Meantime, Monk splits his time between the case and contemplating retirement when he finds he must pass a fitness exam.

Atwater goes undercover to bring down the longtime head of a criminal enterprise and becomes entangled in a situation that tests his allegiances as well as his conscience.

The Lightman Group discovers that a governor's staffer who was killed during a rally right before the election may have been the target all along to protect a cover-up, and Clara might be lying to protect somebody on the inside.

Cole is investigated by the FBI, forcing Murtaugh to question his loyalty to his own partner; Cole works a case that puts Natalie's fiance into the cross-hairs right before their wedding day.

Jonah, weakening, begins to eye his next target. After learning that Jonah is after another sacrifice, the Runaways realize they have to stop him before he kills another kid.

When Malky can't remember committing murder, Harry, Fergus, and Charlie investigate who benefits. Harry mingles with unlikely allies and makes a breakthrough in the sinister case.

Monk is put in an uncomfortable position when Natalie asks him to help investigate the apparent suicide of her old friend's commanding officer.

The violent death of a tough judge's son sets Major Crimes upon a white supremacist biker gang currently in the judge's court. Gustavo must choose between two unappealing choices regarding his sister Paloma.

The FBI investigates the murder of an illegal underground fighter, but Dr. Lightman tries to conceal his relationship to the event. Meanwhile Dr. Foster discovers that her new boyfriend may have a big secret.

The Machine's latest number presents a unique challenge for Reese and Finch since the person has virtually no digital footprint and appears to be leading a double life.

A CIA case officer becomes suspicious that a Marine Sergeant war hero rescued after eight years of captivity in Afghanistan, has been turned into a sleeper agent by Al Qaeda.

Upton and Burgess find themselves in a difficult situation when Intelligence tracks a cache of cop killer machine guns to a local gun show in Wisconsin.

Elena becomes paranoid that she's constantly being watched; Ginny and Elena bond while cleaning out Allie's closet; Elena confronts her past.

The violent death of a tough judge's son sets Major Crimes upon a white supremacist biker gang currently in the judge's court. Gustavo must choose between two unappealing choices regarding his sister Paloma.

The Machine's latest number presents a unique challenge for Reese and Finch since the person has virtually no digital footprint and appears to be leading a double life.

The FBI investigates the murder of an illegal underground fighter, but Dr. Lightman tries to conceal his relationship to the event. Meanwhile Dr. Foster discovers that her new boyfriend may have a big secret.

A CIA case officer becomes suspicious that a Marine Sergeant war hero rescued after eight years of captivity in Afghanistan, has been turned into a sleeper agent by Al Qaeda.