A possible serial-killer case is assigned to Danny and Baez. Erin considers becoming a judge; a mayoral candidate claims that Frank has been secretly investigating her spouse; and Eddie confronts her dad.
Danny is interrogated by the District Attorney's investigator when his ex-partner is accused of planting evidence in order to wrap up a homicide case. Also, when radical anti-government activists threaten to publicly burn an American flag, Frank grapples with the limits of free speech.
Frank worries that a tell-all book about his old cop days will affect his career as PC. Meanwhile, Erin and DA Investigator Abetemarco investigate the murder of another DA Investigator in a bar where they wind up in a conspiracy.
Frank deals with the aftermath of a retired cop who shot his mugger. A trainer flouts authority, mingling with Janko. A man Baez saw kill her friend to death 25 yrs. ago has returned; she and Danny figure out how to bring him to justice.