Fred is living in the Paris Metro system. He is blackmailing Helena, whose safe he has robbed. Fred has various 'friends' all living in this sureal setting. The Roller is a rollerkating bag snatcher and Big Bill is a 'strongman'. The blackmail and Freds relationhip with Helena and her heavies make up the bulk of the plot but on the side are Freds attempts to start a band using busker from the Metro.