TheexpandedthirdseasonpicksupsixmonthsaftertheeventsofseasontwoandfollowsLt.JoeLeaphornandJimCheeastheyinvestigatethedisappearanceoftwoboys,withonlyanabandonedbicycleandblood-stainedpatchofgroundleftintheirwake.Meanwhile,BernadetteManuelitoattemptstosettleintohernewlife500milesfromhomewiththeBorderPatrol,butstumblesacrossaconspiracyinvolvinghumananddrugsmugglingwithfar-reachingimplications.
