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SeasonthreeofCITYONAHILLbringsustoBoston’shighsocietyBeaconHill.HavinglefttheFBIandthrownhisbadgeintoBostonHarbor,JackieRohr(Bacon)landsalavishnewgigrunningsecurityforawealthyfamily.Lifeisgooduntilsecretsbegintounravel.Whenaninvestigationopens,ADADecourcyWard(Hodge)seesanopportunitytofinallyripoutthemachineryperpetuatingabrokencriminaljusticesystem.SiobhanQuays(Banks),representingaconstructionworkerwhowasseverelyinjuredontheBigDig,encountersthecity’scorruptionfirsthand,allwhilecopingwiththetraumaticeventsofherpastyear.AsJennyRohr(Hennessy)canattest,givenherhistorywithherfather,someexperienceswillhauntyoubeyondyourbreakingpoint.