Marcus fears dying while playing Macbeth after three fatal past performances. When Fergus nearly dies onstage, Harry investigates the theatre's dark history.

Topher helps the kids break into school, but the plan is blown when Dale and Stacey trigger an earthquake. Jonah’s body continues to break down as he leads Karolina into the hole.

Adrian finds himself short an assistant when Natalie is hired to replace the local lotto girl after she's murdered.

Against Murtaugh's advice, Cole reaches out to Tom Barnes to help with a case that hits close to home, putting Murtaugh and Cole's partnership to the test. Meanwhile, Trish prepares to announce her campaign for District Attorney.

The Machine leads Reese and Finch to Wall Street when a sharp young trader at a major investment bank becomes embroiled in a multi-million dollar financial scam.

Major Crimes is paired up with an obnoxious FBI Agent on a kidnapping case from two years ago. Rusty continues his investigation on Alice Herrera.

While chasing a heroin supplier, CPD crosses paths with a convicted criminal recently released on a technicality. Halstead's history with the man threatens the team's ability to put him back in prison.

Dr. Lightman helps Torres's half-sister, who is serving time in a juvenile facility, after an fellow inmate who asks for her help is killed. However, Torres is not convinced that her sister can be trusted.

Marcus fears dying while playing Macbeth after three fatal past performances. When Fergus nearly dies onstage, Harry investigates the theatre's dark history.

The Machine leads Reese and Finch to Wall Street when a sharp young trader at a major investment bank becomes embroiled in a multi-million dollar financial scam.

Adrian finds himself short an assistant when Natalie is hired to replace the local lotto girl after she's murdered.

While chasing a heroin supplier, CPD crosses paths with a convicted criminal recently released on a technicality. Halstead's history with the man threatens the team's ability to put him back in prison.

Dr. Lightman helps Torres's half-sister, who is serving time in a juvenile facility, after an fellow inmate who asks for her help is killed. However, Torres is not convinced that her sister can be trusted.

Against Murtaugh's advice, Cole reaches out to Tom Barnes to help with a case that hits close to home, putting Murtaugh and Cole's partnership to the test. Meanwhile, Trish prepares to announce her campaign for District Attorney.

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?

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.

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.

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.

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.

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.

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.

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.

Elena snoops around Torys apartment while helping Darcy and Bennet, which leads to an unexpected discovery in the secret room. Elena is rattled by a surprise call from her past.

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.

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 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.