When a measles epidemic forces the temporary closing of a child care center, the son of a film star and her estranged husband, a concert pianist, is mistakenly delivered to a touring musician.

Audrey Hepburn
as Melissa Walter

Ray Ventura
as Ray Ventura

Henri Génès
as Julien

Georges Lannes
as Detective / Radio Boss

Philippe Lemaire
as Jacques

Danielle Godet
as Jacqueline

John van Dreelen
as Rudy Walter

Marcel Dalio
as Poulos, Imprésario

Suzanne Guémard
as Mrs. Chatenay-Maillard

Nicole Jonesco
as Germaine Dubois