Wide Sargasso Sea
Amélie, Antoinette's maid at Granbois, sleeps with Rochester after he is poisoned by Antoinette. But she's not just a saucy vixen. Like Tia, she taunts Antoinette with racist slurs, and Rochester notes a disturbing similarity between her features and Antoinette's. Amélie is in the story just as much to stress the commonalities between Antoinette and Tia as she is to wreck Antoinette's marriage, precisely by taking Antoinette's place in Rochester's bed.