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.

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.

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.

A gang unit officer deals with the aftereffects of a harrowing encounter, while a husband-and-wife pair of police officers looks to balance work and play.

While they chase the most dangerous criminals in Boston, members of the police department deal with responsibilities at home, and look forward to a department-wide fitness competition.

Officer Jenn Penton tries to help her twin sister escape the throes of addiction, while the fugitive unit searches for a suspect in a two-decade old case.