Answer
Audrey Hepburn was a lead actress in The Nun's Story, a 1959 film directed by Fred Zinnemann. The film is based on the 1950 autobiography of the same name by Catherine de Hueck Doherty, a Canadian-American nun who founded the Madonna House Apostolate in Combermere, Ontario. Hepburn plays Sister Luke, a novice who arrives at the convent and struggles to adjust to the strict rules and routines.