Gustav (Lino Ventura Lino Ventura) is a veteran gangster who finally escapes from prison after being jailed. After that, Gustav defected to his sister Manucci (Christine Fabr é ga), who lives in Paris, hoping to get her shelter. Gustav had long been tired of the infighting in the gang, so he decided to join a gang of outlaws to do one last job and make up for the "pension". However, after years of immersion in the underworld, will it really be so easy to change his face? Detective Brot (Paul Morris Paul Meurisse) follows Gustav as closely as an eagle follows his prey. He doesn't want money or power. His only purpose is to one day find an opportunity to arrest Gustav.