[2] Harry England, a British car salesman on a trip to France, meets a Baroness, "Dany", when her Rolls-Royce breaks down.

The Baron then hires Harry to teach his teenage son about cars on their country estate.

Harry falls in love and asks the Baroness to leave the Baron, who has taken up with a lady of his own.

Darryl F. Zanuck had a long history of trying to turn his European mistresses into film stars – he had previously done this with Bella Darvi, Juliette Gréco and Irina Demick.

[3] Hello Goodbye was created as a vehicle for Gilles, his latest mistress, and was the first production Zanuck personally supervised since he inserted Demick in The Longest Day (1962).