A Stolen Life
A Stolen Life (1946)
Twin sisters Kate and Patricia Bosworth (Bette Davis) fall in love with the same man, Martha's Vineyard lighthouse inspector Bill Emerson (Glenn Ford). Patricia steals Bill away from Kate. Heartbroken, Kate returns to her painting. Bill, now unhappily wed, goes to Chile. While he is away, Kate and Patricia go sailing. Patricia is washed overboard leaving behind only her wedding ring. The boat capsizes. When Kate recovers consciousness she (believed to be Patricia because of said ring) is told that Bill is returning from Chile.
A precursor to the darker Dead Ringer (1964).
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