Frank and Garrett devise a plan to convince Mayor Chase to work better with others in order to properly run the city. Danny and Baez try to track down a perp who vandalized several NYPD vehicles with anti-police graffiti and made threats against officers. Erin is shaken after a car accident. Eddie and Jamie argue about whether they should keep a stray dog who leads them to a crime scene.

Frank takes matters into his own hands to save Gormley's career when complaints against him become public knowledge. Danny and Baez learn to be allies when the transgender community comes under attack.

Tension escalates between Frank and Mayor Chase after Frank makes a public arrest that goes viral. Danny and Baez investigate a gang attack that takes an unexpected turn. Jamie worries when Eddie lies to him about where she's going in the evenings.

Danny crosses paths with a criminal from a previous case when he investigates a gang attack with a shocking motive. Frank and Mayor Chase butt heads over an off-duty cop who goes too far making a political statement.

Danny and Baez investigate a case of grand larceny tied to feuding crime families. Frank clashes with Mayor Chase when an influx of immigrants arrive in the city. Erin questions whether her district attorney campaign is compromising her day job.

Danny and Baez team up with Danny's old partner to find a copycat killer. Frank and Mayor Chase battle over how best to handle the city's rising homeless population.

Jaime goes undercover with a deadly human trafficking ring. Danny and Baez investigate a homicide connected to Danny's old partner. Frank grapples with whether to publicly support Mayor Chase on a policy decision and Eddie is determined to teach a young shoplifter a lesson.