|Danny Kaye||Jack Martin/Henri Duran|
|Gene Tierney||Lili Duran|
|Marcel Dalio||Philippe Lebrix|
|Jean Murat||Felix Periton|
|Henri Letondal||Louis Foral|
|Marina Koshetz||Mme. Louise Cornet|
|Ann Codee||Mme. Periton|
While performing in the French Riviera, entertainer Jack Martin finds he can do an uncanny impersonation of wealthy businessman Henri Duran (also Kaye), so much so that no one can tell the difference between the two. When a pressing business engagement requires Duran's presence, he hires Martin to take his place at a party Duran is supposed to be hosting. It turns out the plan works -- too well. Soon, Martin finds himself beset by Duran's wife, as well as his many mistresses.