The Wings of the Dove (1997)
Kate is secretly betrothed to a struggling journalist, Merton Densher. But she knows her Aunt Maude will never approve of the match, since Kate's deceased mother has lost all her money in a marriage to a degenerate opium addict. When Kate meets a terminally ill American heiress named Millie traveling through Europe, she comes up with a conniving plan to have both love and wealth. london, england, based on novel or book, venice, italy, love triangle, masked ball, gondola, forbidden love, man between two women, unrequited love, inheritance, british high society, dying woman, dying young, privileged life, 1910s, classism, period piece, influential aunt or uncle