Boston Blue season 1 episode 3 recap: Who was the drug dealer?

Boston Blue season 1 episode 3, titled History, aired on October 31, 2025. It maintains the series' mix of street-level police work, family drama, and moral tension as Donnie Wahlberg's Detective Danny Reagan remains a centerpiece. This episode follows a drug investigation that begins when the dead and overdosed body of a young woman, Kathy Sullivan, is found at the wharf in Boston.

Kathy had overdosed on a potent new drug nicknamed "Killer Whale," and this introduces a part of the investigation that brings Danny together with Lena and Brian Rodgers, Lena's former partner. The stakes become elevated and serious when viewers learn that the drug dealer, Mitchell Edgars, is willing to kill to hide evidence.

Towards the end of Boston Blue season 1 episode 3, Lena and Danny arrest Edgars and remove this dangerous drug from the streets for Kathy. The episode also explores other personal and professional frictions between the three, which adds additional tension to the investigation and the character relationships.

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Jonah and Sean's scavenger hunt in Boston Blue season 1 episode 3

A still from the episode (Image via Instagram/@bostonbluecbs)

In Boston Blue season 1 episode 3, Jonah and Sean, the young patrol officers, are approached by Mrs. Katz, an elderly neighbor who is concerned about the sudden disappearance of her friend, Murray Bennett, an enthusiast of online scavenger hunts. Despite being reminded by Sean that they are not detectives, Jonah promises to find Murray, breaking a cardinal rule of their profession.

Breaking free from the shackles of street patrol, the duo follows the digital trail on the "Bullseye" website, which sets off a search for Murray at several venues across Boston. They find him stuck in an abandoned storage building with injuries, the phone dead, and all but lost. Their digging beyond the protocols saves a life and cements them as partners who could face censure for doing the right thing.

Also read: Boston Blue season 1 episode 2 recap: How did Winston Ballard die?

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Sarah and Phoebe's family struggles in Boston Blue season 1 episode 3

Another standout subplot in Boston Blue season 1 episode 3 is Sarah's guardianship of her boyfriend's teenage daughter, Phoebe. While her father is away, Sarah finds Phoebe drinking with older boys, a situation tumultuous with risks and rebellion. Sarah's intervention is sure but not at all easy, as Phoebe immediately deems her "lame" and too controlling.

As it plays out, Sarah's steady presence and concern break through Phoebe's defenses. By the end of the night, after Sarah continues to watch out for her, Phoebe expresses surprising gratitude and revises her initial hostility toward Sarah.

Also read: 10 highly anticipated TV shows we can’t wait to watch in Fall 2025

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Other highlights from Boston Blue season 1 episode 3

A still from the episode (Image via Instagram/@bostonbluecbs)

In addition to the investigation of the major drug case, numerous personal and emotional storylines are explored in Boston Blue season 1 episode 3. Lena revisits her past with Brian, her ex-partner, who has feelings for her. This makes things even more intense, as professional and personal boundaries become blurred.

Meanwhile, May, the assistant district attorney, brings up a sensitive case involving a rape victim whose past as an adult film actor might work against her in court. May is committed to seeing justice through and skillfully prosecuting the case, ensuring that the perpetrator faces the full force of the law.

Lastly, Danny receives a visit from his girlfriend, Maria, showing that he has a life beyond all the intricate investigations he undertakes.

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Boston Blue season 1 episode 3 is available to stream on Paramount+.

Edited by Riya Peter