: Frank struggles to maintain his moral compass and departmental control in an era of heightened public scrutiny and political maneuvering. Legal and Romantic Tensions: Erin, Jamie, and Eddie
: While he remains a dedicated detective, he forms brief, poignant bonds with others who have suffered loss, such as in the episode "Common Ground," where he protects a nurse from a violent ex-boyfriend. Political Friction: Frank and the New Mayor
Commissioner Frank Reagan (Tom Selleck) faces a new adversary in Interim Mayor Margaret Dutton (Lorraine Bracco).
: The two frequently butt heads over progressive reforms, such as the elimination of solitary confinement and the handling of police-related lawsuits.