Elmer Moffatt , a cunning financier from Apex whom Undine marries
Ralph Marvell , a New York society gentleman who marries Undine, has a son with her and is then divorced by her
Peter Van Degen , a man with whom Undine has an affair
Clare Van Degen , married to Van Degen, unhappy with their marriage; she is Ralph Marvell's cousin who is deeply in love with him
Charles Bowen , an elderly man from New York City, who acts as a kind of observer; friend of Laura Fairford
Raymond De Chelles , a French aristocrat who marries Undine after she is widowed; he is her third husband
Paul Marvell , Undine's and Ralph's child, Raymond's stepson
Laura Fairford , Ralph Marvell's sister; due to the customs of the era, she needed to invite Undine to dinner in order for Ralph to indirectly see her again
Henley Fairford , husband to Laura Fairford
Claud Walsingham Popple , a painter who paints a portrait of Undine
Mrs. Heeny , a masseuse who keeps company first with Undine and Mrs. Spragg and later with Undine and her son; she also keeps clippings of all high society events
Celeste , Spragg family's French maid.
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