Claim: The Three Faces of Eve, a 1957 mystery drama, features a plot in which a mother learns she has multiple personalities.
Evidence: The Three Faces of Eve is a 1957 American mystery drama film presented in CinemaScope, based on the book of the same name about the life of Chris Costner Sizemore, which was written by psychiatrists Corbett H. Thigpen and Hervey M. Cleckley, who also helped write the screenplay. In 1951, Eve White is a timid, self-effacing wife and mother who has severe and blinding headaches and occasional blackouts. Eventually goes to see psychiatrist Dr. Luther, and while having a conversation, a "new personality", the wild, fun-loving Eve Black, emerges.