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When a young man is urged by his self-centered girlfriend to steal a jewel, he barely pulls off the stunt, hiding it in a guitar as he is being pursued. Before long, however, he has a change of heart and decides to dump the girl and return the gem. Now he must find the right guitar -- which may be in the possession of any of five performers. Franck Fernandel, son of popular French comedian Fernandel, stars with Dany Saval, Berth Grandval and Dominique Boschero -- featuring performances by musical talents Charles Aznavour, Nancy Holloway, Johnny Hallyday, Sylvie Vartan and Frank Alamo.