Malcolm continues to unravel as the mystery of the girl in the box comes to a head. As Nicholas Endicott's (guest star Dermot Mulroney) true colors continue to show, the Whitlys must decide to what lengths they are willing to go in order to take him down

Bright's quest for answers about his childhood leads him to a junkyard, where he's bombarded with gunshots. Ainsley's exclusive interview with Martin takes an unexpected turn, forcing her to team up with Bright.

Knowing that the “Junkyard Killer” was in cahoots with his father, Malcolm goes against the FBI’s wishes and continues to investigate. His findings reconnect him with a disgruntled ex-detective who was once heavily involved in the search for “The Surgeon,” delivering them both into danger.

The FBI and NYPD band together to save Malcolm from the "Junkyard Killer," aka John Watkins, who reveals shocking details about his involvement in the camping trip memories that have been plaguing his psyche. Meanwhile, as Gil looks for answers from The Surgeon, Ainsley and Jessica search through their memories of the past, hoping to find some sort of clue as to where Malcolm could be hidden.

After a catastrophic turn of events, Malcolm and Ainsley are convinced there's more to Nicholas Endicott than meets the eye. Their only hope just might be an impromptu Whitly family reunion.

Malcolm takes a detour from his mandated vacation time when he finds out a killer on the loose is mimicking homicides from one his favorite children's books, "The Count of Monte Cristo." With added help from a very excited Martin Whitly, the NYPD trace the case back to a high society family planning one of the biggest weddings of the season, so Malcolm and Dani get dressed up to attend the event and track down their culprit.

Malcolm realizes the suspect in the "Junkyard Killer" case may have a connection to his father.

Following a mysterious and catastrophic incident in the precinct, Bright faces an internal affairs review as Gil and the team worry about his mental health.

When world-famous Europol profiler Simon Hoxley shows up in New York and claims that Major Crimes' current case is connected to the discovery of Endicott's body overseas, Bright fears he and Ainsley's secret is about to be exposed. Meanwhile, Martin gets to know Dr. Vivian Capshaw.

Jessica continues to search for more information on the "Girl in the Box," but is confronted by the "Carousel Killer," who has a very public vendetta against the Whitlys. While the NYPD investigates families tied to Martin's victims, it's ultimately up to Malcolm and Jessica to track down the tip-line caller, turned killer, who is blackmailing her. Meanwhile, Ainsley receives a big promotion at work, but quickly realizes she may never escape the high demand for serial killer reports.

When Martin is locked away in solitary confinement and the FBI takes over the Junkyard Killer case, Malcolm uses his spare time as an excuse to try out a “normal” lifestyle.

When an up-and-coming ballet dancer is mysteriously poisoned, the NYPD dives deep into the rigorous world of dance. Meanwhile, Jessica reunites with an old friend, socialite Nicholas Endicott, and Bright and Eve turn to Martin for answers regarding the girl in the box.

Martin is delighted when a murder at Claremont Psychiatric brings the NYPD into his territory, allowing him direct involvement with one of Malcolm's cases. While working the same job, Ainsley's suspicion grows when she feels Malcolm may be hiding something from her. All the while, Malcolm and Ainsley must dodge their mother, who's wondering why they got rid of her favorite rug.

The team investigates the murder of an architect who was tasked with renovating a supposedly haunted hotel.

Malcolm focuses on a case in which a famous plastic surgeon is murdered; Martin gets a new job working in the infirmary with Dr. Vivian Capshaw; Jessica is surprised to learn her younger sister is in town.

As Malcolm distances himself from Martin, Jessica does the opposite, diving head-first into the past for the sake of her tell-all book. Meanwhile, Martin is desperate to get in touch with his son ahead of his imminent plans, as Dr. Vivian Capshaw grows increasingly suspicious. Meanwhile, the NYPD investigates a crime of passion.

As the search intensifies for a serial killer on the run, so does Malcolm's tenacity, causing U.S. Marshal Emily Ruiz to kick him off the case. However, Malcolm doesn't back down that easily.

Bright deals with the repercussions of seeing his father for the first time in years.

When a body is found professionally preserved and embalmed, the NYPD teams up with Edrisa to go undercover at a convention of funeral directors. While there, they discover their top suspects - morticians Tilda and Dev - who used to be in business with the victim. Then, enter the mind of a serial killer as Martin revisits his past through a series of hallucinations.

When a motorcycle gang robbery turns into a murder, Malcolm and team are called to the scene to investigate. While he's working on a profile, he runs into an old friend from boarding school, licensed insurance investigator Vijay (guest star Dhruv Singh). Together they work to uncover the identity of the murderer and his accomplices who stole millions in watches. Meanwhile, Martin blackmails Jessica, exchanging his silence about who stabbed him for more quality time with his son.

The NYPD dives into a case surrounding a famous mommy blogger, whose husband was mysteriously stabbed just days after their baby was born. Meanwhile, Bright finds his way back to Eve, but can't shake his paranoia that there's more to her than meets the eye. To help ease his nerves, Ainsley helps him do some investigating and uncovers a secret she has been keeping.

As Bright slips into the mind of a serial killer, he must deal with the repercussions of seeing his father for the first time in years.

When Bright uncovers a photo of himself and Martin from when he was a kid, he is forced to focus on the repressed memories from his childhood psyche. Jessica and Malcolm agree they must put a stop to Ainsley's idea.

Despite Gil's fatherly concerns, Bright throws himself into a new case involving an escalating killer that has Edrisa's online vigilante group, known as the "Killabustas," trying to stop him. Meanwhile, Jessica realizes that she must dive deep into her past traumas in order to write a book and may need Gil's help to do it. Then, Martin's relationship with Dr. Capshaw intensifies.

After a terrifying incident at Claremont, Malcolm is in a race against time to track down multiple killers. The NYPD realizes someone close to home might be the key to finding them.