With memories of the tragic marathon bombings still fresh, the Boston Police Department is on high alert during the city's July 4th celebrations.
After yearlong tensions between rival gangs culminate in back-to-back retaliation shootings in a single night, Detective Tim Stanton leads an investigation involving both the Gang and Fugitive units to end the battles once and for all.
Officer Jenn Penton reunites with her troubled twin sister after her stay in drug rehab. Meanwhile, on the hunt for a suspect in a violent robbery, the Fugitive Unit responds to their worst nightmare: a call that a fellow officer’s been shot.
Detectives Tim Stanton and Rich Medina are determined to uncover the truth in a mutilation case that has scared the victim into silence. Off duty, Officer Jenn Penton steps into the boxing ring for the first time to fight for a cause close to her heart.
Gunshots at a party set off an intense pursuit for Officer Terrique Chambers and the Gang Unit. While off-duty, Chambers plans a large event to raise money for the organization that has helped his autistic son make remarkable strides.
Devoted husband, father and Gang Unit Officer Greg Dankers works relentlessly to offer justice to a victim. Meanwhile, a fellow officer decides it’s time to prepare a surprise proposal to his girlfriend.