AvirusbreaksoutandachillingmassacreragesthroughthestreetsofMontevideo.Thesickbecomehunters,andonlycalmtheirfeverbyunscrupulouslykillingallthosenotyetinfected.Unawareofthis,IrisandherdaughterspendthedayinthesportsclubwhereIrisworksasasecurityguard.Whenthenightcomesafightwithoutmercyisabouttobegin.Theironlyhopeofsalvationarriveswhentheydiscoverthataftereachattacktheinfectedseemtohave32secondsofpeacebeforechargingagain.