Bright finds his personal life in disarray after his sister's shocking actions; he must take care of her and protect his mother from a secret that could tear the family apart all over again; Malcolm must find a killer.

When a priest is found murdered in his place of worship, Bright grapples with its effect on his own trauma; Ainsley grows worried that Jessica is keeping something from her regarding her relationship with Gil.

When the headmaster of Bright's alma mater is found murdered, he is forced to face a troubling secret from his past. Meanwhile, Jessica struggles with her decision to end things with Gil, Martin grows closer to Friar Pete (guest star Christian Borle) and JT eagerly anticipates the birth of his baby.

Martin is delighted to be involved in one of Malcom's cases. Ainsley suspects Malcom is hiding something from her.

Malcolm and Ainsley race to find the serial killer committing the "Debutante Killings". Martin is thrilled by his daughter's passion. Jessica suggests a mother-daughter vacation.

Malcolm has an accident and his mind sends him in another world, where his family is happy and he is in a good relationship. While his mind is going on a journey, his subconscious tells him, that something isn't right.

Malcolm, still reeling from the latest events with Ainsley, focuses on the next case, in which a famous plastic surgeon is murdered. Meanwhile, Martin gets a new job working in the infirmary with resident MD Dr. Vivian Capshaw. Then, Jessica is surprised to learn her younger sister is in town.

A world famous profiler shows up claiming the latest Major Crimes death is linked to Endicott's murder. 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.

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.

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.

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.

The search for a serial killer known as "The Woodsman" might help the NYPD find one of their own.