When a student is shot by a rival gang member in his high school courtyard, Danny and Baez try to get a grasp on the situation to prevent a reoccurrence, but the principal recklessly takes matters into his own hands. Also, Erin tries to help her friend, who is mixed up in an illegal gambling ring. Meanwhile, Governor Mendez tries to frame Frank after one of his top legislative aides is shot by an NYPD officer.