Danny, Sarah and Lena race to stop a looming threat on St. Patrick's Day. Meanwhile, homesickness sparks a family gathering, and Lena's personal life takes a hopeful turn.

Danny and Lena race to stop a string of violent crimes before the situation spirals out of control, while Sarah's plans for a family outing take an unexpected turn. At the same time, Jonah and Sean chase a case with surprising twists, and Mae receives an invitation that could change everything.

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.

Mae faces public and family backlash over the consequences of her past decisions; Sarah struggles with guilt that pushes her to take risks in pursuit of justice; Lena and Danny dive into a tense homicide case.

Danny and Lena's investigation into a robbery gone wrong quickly turns personal; Sean and Jonah face rising tensions with Boston's firefighters; Sarah clashes with boyfriend Seth over family discipline.

Lena's pursuit of justice forces Danny into an unexpected role reversal; Sarah faces a personal dilemma that tests her resolve; Mae contends with political pressure; Sean and Jonah uncover more than they anticipated during a routine case.

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

Danny and Lena take on a high-stakes murder case that leads to one of Boston's most infamous unsolved crimes; tensions rise within the Silver family as a complex shooting case sparks debate over accountability and parenting.

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; Sarah responds to a hostage crisis; Mae faces a difficult legal decision.

A body found on the Boston wharf pulls Lena and Danny into a tense drug investigation; Jonah and Sean chase down a missing man tied to a scavenger hunt; Sarah and Mae navigate emotional challenges at home and in court.

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; Jonah and Sean prepare for their first official day on the job.

NYPD detective Danny Reagan teams up with Boston detective Lena Silver to investigate a deadly fire at a tech company; as they dig deeper, they uncover a complex web of secrets involving facial recognition technology.