The story concerns a veteran playboy screenwriter named Richard Benson (William Holden) who has been paid to write a screenplay for his boss, Mr. Alexander Myerheim (Noël Coward). Overly confident in his writing abilities, he puts off writing the screenplay until just two days before it is due. Gabrielle Simpson (Audrey Hepburn), a temp secretary hired by Benson to type the script, comes to Richard's hotel room where they are to spend the weekend. Richard and Gabrielle come up with various off-the-wall scenarios for his screenplay, called The Girl Who Stole the Eiffel Tower. As the script unfolds, so does the romance between the two writers.
Some members of the cast have roles in The Girl Who Stole the Eiffel Tower, the film-within-the-film.