I Am Mary Dunne (1968) is a novel by Brian Moore about one day in the life of a beautiful and well-to-do 31 year-old Canadian woman living in New York City with her third husband, a successful playwright. Triggered by seemingly unimportant occurrences, the protagonist / first person narrator remembers her past in a series of flashbacks, which reveal her insecurities, her bad conscience concerning her first two husbands, and her fear that she is on the brink of insanity.

Of all of Moore's books, I Am Mary Dunne has been described as "perhaps his best novel" in The Cambridge Guide to Literature in English (ed. Ian Ousby, 1988).

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