Lena and Danny are pulled into a high-stakes murder investigation when a whistleblower tied to one of Mae's court cases is found dead.

A body found on the Boston wharf pulls Lena and Danny into a tense drug investigation alongside Lena's former partner, Detective Brian Rodgers, sparking personal and professional friction. Jonah and Sean chase down a missing man tied to a scavenger hunt, while Sarah and Mae navigate emotional challenges at home and in court.

As the Silver family observes Yahrzeit to honor patriarch Ben Silver on the one-year anniversary of his death, Lena and Danny investigate the murder of a beloved shop owner.

Danny and Lena take on a high-stakes murder case that leads to one of Boston's most infamous unsolved crimes.

With an assist from NYPD's Maria Baez, Danny and Lena hunt down a serial home invader. Sean's budding romance faces unexpected complications. Meanwhile Mae and Sarah uncover a troubling leak that could upend the justice system.

Lena's pursuit of justice forces Danny into an unexpected role reversal, while Sarah faces a personal dilemma that tests her resolve. Meanwhile, Mae contends with political pressure.

Danny and Lena’s investigation into a robbery gone wrong quickly turns personal, pushing Lena to devise a bold plan that tests Mae’s boundaries. Meanwhile, Sean and Jonah face rising tensions with Boston’s firefighters, and Sarah clashes with boyfriend Seth over family discipline

Mae faces public and family backlash over the consequences of her past decisions, while Sarah struggles with guilt that pushes her to take risks in pursuit of justice. At the same time, Lena and Danny dive into a tense homicide case, and Jonah's anger over his father's death threatens to unravel fragile family ties.

Following the release of Ben's killer from prison, Jonah continues to struggle with anger and grief confronting the killer and putting family bonds to the test, and Mae and Sarah face painful truths that could change everything. Meanwhile, Danny and Lena take on a high-stakes case that uncovers deep-rooted secrets and forces unlikely alliances.