Season 2

After a stint in Afghanistan, Officer Jenn Penton patrols Boston with a rare intensity and sense of purpose - particularly when it comes to getting drugs off the street. Meanwhile, Greg Dankers and the Fugitive Unit search for a drug dealer convicted of selling crack cocaine and gun ammunition in a Roxbury school zone.

The officers of the Boston Police Department live in the city they are dedicated to protecting, working to balance fighting crime with finding time for family. For the department's Gang Unit, the target is a well-known figure whose capture becomes personal. Meanwhile, the Fugitive Unit cases the streets of Charlestown for a local suspect wanted on charges in New Hampshire. And on-duty Patrol Officers drive through the city streets, encountering an assortment of characters and challenges on every shift.

The Boston Police conduct a massive drug raid in South Boston, and a patrol officer looking for love experiments with speed dating.

In Dorchester, a string of gang-related shootings has the Boston Police Department on high alert. Things take a turn for the worse when a 20-year-old apparent gang member is shot execution-style in a local barbershop. With retaliation expected, the cops do everything they can to calm tensions and prevent another tragedy. Across town, the Fugitive Unit is on the trail of a dangerous knife-wielding robbery suspect.

After more than a quarter century as a Boston cop, and following a year filled with personal difficulties, Robert "Twitch" Twitchell has gotten a call: He's being promoted to Sergeant. Now, with just a week left as a detective on the gang unit, he's focused on bringing in one last criminal, a gang member wanted for assault with a firearm. Leading the search for the suspect, though, will require every bit of wisdom and experience he's acquired on the job. Meanwhile, on the night gang unit, it's a very different kind of week for Officer Myles Lawton, as the anniversary of the murder of his father, a former cop himself, is approaching. The emotions are complicated by a frustrating case in Roxbury, where a shooter got away, and no one seems to know anything about him.

It's been a little more than a year since gang unit officer D Araujo found himself staring at the wrong end of a gun at close range on a chase for a suspect. He made it out, but the experience has stuck with him, particularly on cases like the one he's on now - teaming up with the SWAT team to capture a suspect who's been involved in a series of gun battles in Mattapan. Meanwhile, over on the fugitive unit, Greg Dankers works days tracking down criminals while his wife Nancy, also a cop, works nights. With twin boys at home, that doesn't leave many openings for date nights, but as he pursues a suspect, he's hoping there will be enough time to cook his wife dinner after the catch. And for patrol officer Jenn Penton, the ongoing events with her troubled sister is a reminder of how much family matters.