《重案组女警第四季》JanetispromotedtosergeantbutstepsdowntogiveittoRachelasshefeelssheisneededmoreathome.ThepairjointhesearchforeighteenyearoldRobinMcKendrick,asimpleladreportedmissingbyhisboss,landlordJohnRivington.PubregularsareunforthcominguntilaboycalledJohntellsJanetthatanex-soldierknownasJackie-BoylockedRobininhiscarbootasacruelprank.Helaterreportedthecarasstolen.AnotherwitnessclaimsthatJackie-BoydumpedhiscarinaquarrywithRobinstillintheboot.IntheprocessoftheinvestigationGillidentifiesanotherbodyfoundintheriver,thatofMandySweeting,whodisappearedtwodecadesago.