In1996agunmanopenedfirefromthetopofamultistorycarparkkillingpassersbyonWhitewaterHighStreet.SinceknownastheWhitewatermassacre,oneofthevictimswasatacticalsquadpoliceofficer,Sgt.NickPatterson,Supt.PeterBoydsbestfriend.Pattersonspolice-issuedGlockpistoldisappearedandwastheweaponusedtokillhim.TheGlockdisappearedthatdaybutisfoundsevenyearslaterbytwoboyssome10milesfromWhitewater.Boydandhisteamareassignedtosolvethemysteryofthevanishinggunastheconvictedsniperssolicitoriscallinghisclientsconvictionintoquestion.Astheinvestigationcontinues,theteambegintodiscoveranomaliesthatmayinfactmeantheconvictedkiller,CarlMackenzie-whoalwaysmaintainedhisinnocence-mayhavebeenwronglyconvicted.