

The police department is on high alert during Boston's Fourth of July celebrations.

After tensions between rival gangs culminate in back-to-back retaliation shootings, Detective Tim Stanton leads an investigation to end the violence.

Officer Jenn Penton reunites with her troubled twin sister; the Fugitive Unit responds to a call about an officer shooting.

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.