Luthers (Merani Roland M é lanie Laurent) is a professional killer who has been in the profession for a long time, immersed in a life full of blood and killing all the year round. Luthers is physically and mentally exhausted, only hoping to find the opportunity to quit and return to a normal and peaceful life. In order to realize her wish, Luthers took on the last and most dangerous task, going to a castle in the Alps to kill the tenor Arizona (Christopher Stills) who performed in the festival concert. To Luther's surprise, her whereabouts were exposed. In order to protect Mount Arizona, the French counterespionage agency sent a former agent named Rick (Clovis Cornella Clovis Cornillac) to lurk around Luthers, using all means to sabotage Luther's operation.