The film tells the story of three presenters on Radio X, an amateur clandestine radio station.

Philippe, an employee at the Bourdinet firm, having been caught kissing Jacqueline, his boss's daughter, is fired. Some time later, Bourdinet launches a radio quiz show to boost his business. Philippe then decides to compete in the hope of telling the thousands of listeners what he thinks of the industrialist. A blow on the head having given him a gift of second sight, the competitor becomes impeccable and wins astronomical sums to the great despair of Bourdinet. Everything will work out in the end and Philippe will be able to marry Jacqueline.