Carrie and Saul identify Walker's contact in Washington but their target has diplomatic immunity; Brody is approached to run for a disgraced congressman's seat in the House of Representatives.

Frank and Joe exchange truths with their Grandmother and find a long-hidden secret in her home. Fenton finds what he's looking for. Meanwhile, other forces work against them all.

Karolina, Chase and Janet plot their own escape from the Algorithm, while in the real world the rest of the Runaways team up to fight Jonah and get them out.

Monk gets hired to follow his childhood bully's wife who is suspected of having an affair, and Monk hopes she is.

Carrie and Saul identify Walker's contact in Washington but their target has diplomatic immunity; Brody is approached to run for a disgraced congressman's seat in the House of Representatives.

When The Machine gives Reese and Finch the number of a mob enforcer whose life becomes endangered, they must decide whether the killer's life is worth saving.

A gun used in a gang-related double homicide is tied to a 12-year-old off duty police shooting and, eventually, a local pastor who's an outspoken critic of the LAPD. Meanwhile, Rusty finds out that his mother might be in danger.

When Kelton is found murdered, Voight's grudge against the mayor-elect puts him under suspicion; Upton and Halstead want to prove their sergeant's innocence, but the more evidence they gather, the closer they come to doing the opposite.

While Dr. Lightman investigates who was responsible for a deadly coal mine explosion, the FBI questions Dr. Foster about Dr. Lightman's gambling associates.

Frank and Joe exchange truths with their Grandmother and find a long-hidden secret in her home. Fenton finds what he's looking for. Meanwhile, other forces work against them all.

When The Machine gives Reese and Finch the number of a mob enforcer whose life becomes endangered, they must decide whether the killer's life is worth saving.

Monk gets hired to follow his childhood bully's wife who is suspected of having an affair, and Monk hopes she is.

When Kelton is found murdered, Voight's grudge against the mayor-elect puts him under suspicion; Upton and Halstead want to prove their sergeant's innocence, but the more evidence they gather, the closer they come to doing the opposite.

While Dr. Lightman investigates who was responsible for a deadly coal mine explosion, the FBI questions Dr. Foster about Dr. Lightman's gambling associates.

Carrie and Saul identify Walker's contact in Washington but their target has diplomatic immunity; Brody is approached to run for a disgraced congressman's seat in the House of Representatives.

The Runaways become suspicious of one another with a traitor among them. Catherine takes responsibility for her past. Leslie seeks help protecting the child growing inside her.

Taking a step farther than their mother did and learning the nature of the object at the heart of the mystery, Frank and Joe's unity fractures over what to do next. Tensions between Chet, Callie, Frank and Stacy reach a peak.

When Monk's neighbor Kevin is found dead backstage at a magic show, Monk begins to suspect Kevin's old mentor, The Great Torini. The problem is, he has a perfect alibi.

The team searches for more clues after the Uzi from the shootings is found in the church, but the bad blood between Hickman and Tao reaches the boiling point. Meanwhile, more clues indicate that Rusty's mom may be in danger.

Dr. Lightman goes all-out to expose a self-help cult leader after one of its members tries to commit suicide but quickly returns to the fold despite the protestations of her daughter.

Reese must protect an investigative journalist without her knowing it or risk becoming part of her story.

Saul finds Carrie hospitalized and manic, but realizes her chaotic theories have merit; before his congressional campaign begins, Brody takes his family on a weekend trip to Gettysburg.

When Atwater goes undercover in a drug syndicate, he learns there may be more to its kingpin than meets the eye; Halstead tries to join Atwater undercover, but finds himself at a disadvantage.

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

The team searches for more clues after the Uzi from the shootings is found in the church, but the bad blood between Hickman and Tao reaches the boiling point. Meanwhile, more clues indicate that Rusty's mom may be in danger.

Reese must protect an investigative journalist without her knowing it or risk becoming part of her story.

Dr. Lightman goes all-out to expose a self-help cult leader after one of its members tries to commit suicide but quickly returns to the fold despite the protestations of her daughter.

Saul finds Carrie hospitalized and manic, but realizes her chaotic theories have merit; before his congressional campaign begins, Brody takes his family on a weekend trip to Gettysburg.