I was keen to see this film when it was recently broadcast by a minority BBC channel since I was unable to learn much about it in advance; it was not reviewed by Variety nor were there any comments on this database. To summarize the very thin story, the staff of a nightclub run by crooks leave to set up their own club (early Beat Generation) which is very successful and therefore find themselves pressurized to pay protection to the crooks which they won't, etc. etc.
The (presumably) main attraction when this was made was Jacques Helian whose orchestra is featured like the Glenn Miller band in films like "Sun Valley Serenade" but rather less spectacularly with a bunch of indifferent novelty numbers.
The main interest of this film for today's movie fan is the 22-year old Jeanne Moreau in her second film role. She was then under contract with the Comedie Francaise who probably made better use of her talent than she is offered here in the thankless role of the love interest of an existential poet!