Last episode
Blood Diamonds
s02e05 · 2026-11-07 · 03:00
What it is
In Boston Blue, NYPD Detective Danny Reagan takes a position with Boston PD. Once in Boston, he is paired with Detective Lena Silver, the eldest daughter of a prominent law enforcement family.
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Next episode
Bloodlines
s02e06 · 2026-11-14 · 03:00
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Episode guide
9 this season · 29 totals02e01 The Crash 2026-10-10 02:00
The Crash
When a series of murders begins mirroring the infamous Boston Strangler killings, Danny and Lena race to stop a copycat killer before he strikes again. As panic grips the city, Jonah and Sean, fresh off their rookie year, as well as Henry Reagan, jump in to help Danny and Lena track down and arrest the killer. Also, Danny faces a career-defining promotion while Lena uncovers a lead that could link the attack on Detective Rodgers to a powerful figure.
s02e02 Ripple Effect 2026-10-17 02:00
Ripple Effect
As Danny and Lena follow a promising lead in the attack on Detective Rodgers with the help of her father, they find themselves in an intense standoff with a dangerous biker gang. Meanwhile, Mae faces renewed pressure from political rival Thad Longfellow, Sean and Jonah attempt to make amends after a misstep at work and Baez is confronted with an unexpected family matter.
s02e03 Fire in the Hole 2026-10-24 02:00
Fire in the Hole
When a subway station shootout leaves a detective critically injured, Danny and Lena race to determine what really happened before mounting public pressure and political fallout derail the investigation. Meanwhile, Sean and Jonah search for a young witness whose testimony could change everything, Sarah faces increasing conflict with Chief Lanigan over the direction of the case, and Sean grapples with how police work affects those closest to him.
s02e04 Everything Right Can Still Be Wrong 2026-10-31 02:00
Everything Right Can Still Be Wrong
When human remains are discovered inside a great white shark, Danny and Lena find themselves hunting a killer. Meanwhile, Sarah reopens a troubling case from her past and Sean and Jonah get caught in the middle of a neighborhood feud.
s02e05 Blood Diamonds 2026-11-07 03:00
Blood Diamonds
Jamie Reagan's visit to Boston takes an unexpected turn when he and Danny are drawn into a diamond heist linked to a violent family feud, forcing the brothers to confront lingering tensions of their own. Meanwhile, Mae faces a difficult case after swatting results in a man's death, Lena investigates a series of suspicious deaths linked to one of Reverend Peters' parishioners and Sarah and Seth encounter an unexpected hurdle while planning their wedding.