Malcolm searches the depths of his mind to unravel the mystery of the girl in the box. When the NYPD investigates a homicide and assumes it is linked to a drug cartel, Malcolm discovers a secret about Dani's past that draws them closer together.

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 and JT eagerly anticipates the birth of his baby.

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.