Twoworking-classyoungmendreamofmakingitbigwiththeircuartetoband.Onenighttheygetcaughtupinacrimetheydidn'tcommit.Knowingthattheirorigincondemnstheminadvance,theyfleewithnootheroption. AdecadeandahalfafterDecaravana,RosendoRuizreturnstothenightandCuartetomusic.Butthistimethereisachangeingenre:ifDecaravanawasanocturnalmusicaladventure,Leftyisadetectivefilmloadedwithmusicandwithafewobscuritiesthatgobeyondthenight.WhatremainsbetweenthatbeginningofRuiz'scareerandthepresentishisenergy,hissteadyhandasafilmmaker,hisvocationforacommunicablestory,hisnarrativepride.And,asitusuallyhappenswiththefilmsbyfilmmakerswiththatvocation,theactions-eventhoseapproachedwithspeed-triggerthecentralthemes-power,socialclassrelations,thedreamofrisingthroughtheranks-withouttheneedtostopthemovement.