As Malcolm's childhood memories surface, he realizes his father's killing spree may not have been a surprise to everyone in the family. Malcolm, Gil, Dani and JT hunt for a stalker with a creepy eye for design.

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.

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.

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 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.

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.

Bright finds his personal life in disarray after his sister's shocking actions. Now, he has to "take care" of her and protect his mother, Jessica, from a secret that could tear the family apart all over again. To distract himself, Malcolm takes on a new case and must find the killer behind a recent beheading in the city... and the only person he can turn to for help with the case is his father. Meanwhile, Martin returns to Claremont to a surprise new roommate and JT faces discrimination while on the job.

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.

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.

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.