My Lady Below the Stairs

Jane is the illegitimate daughter of a noble, consigned to work as a maid in the very house of her father. She has grown up with her spoiled legitimate sister and an indifferent father who never really acknowledged her presence. Since she's the spitting image of her sister, she is blackmailed into pretending to be her sister to accept a marriage proposal from a nobleman, since her sister has run off with an impoverished Italian artist. Jane would have said no, but her father's steward threatened to let go of her sweetheart, Ian, a stablehand, without a reference. She can't let that happen, so reluctantly agrees to impersonate her sister.