Inthemiddleofaroutinepatrol,officerDanielCarterhappensuponablood-soakedfigurelimpingdownadesertedstretchofroad.Herushestheyoungmantoanearbyruralhospitalstaffedbyaskeletoncrew,onlytodiscoverthatpatientsandpersonnelaretransformingintosomethinginhuman.Asthehorrorintensifies,Carterleadstheothersurvivorsonahellishvoyageintothesubterraneandepthsofthehospitalinadesperatebidtoendthenightmarebeforeit'stoolate.