An old man against the public housing project.

Rival brother and sister Gaëtan and Chantal, the last heirs of the late billionaire financier Omar Porassis, use every trick in the book to try and claim his fabulous inheritance when two of Omar's natural sons, Roger and Marc, are found. The brother and sister try to manipulate Marc and Roger into stealing their inheritance. After discovering the deception, the two half-brothers join forces to escape the many traps set by Gaëtan and Chantal, who try to eliminate them by any means necessary.

Marc, a motorcycle brigadier, is engaged to the charming Véronique. But his future brother-in-law, the clumsy Roger, leader of a Sunday motorcycle gang, has set his sights on joining the motorcycle police.

Rejecting the union of her daughter Brigitte with a modest worker, Madame Magnin invents an adultery for the lover, then introduces Brigitte to a good-looking man working on the famous RTF entertainment show 36 Chandelles. The show ultimately seals the reunion of the two estranged young lovers. The story features a parade of music-hall stars from the era: Charles Trenet, Charles Aznavour, Georges Guétary, Juliette Gréco, Roger Pierre and Jean-Marc Thibault, Fernand Raynaud, Georges Ulmer and many more.