The writing credits for I Walked with a Zombie on IMDB include the following: "Charlotte Brontë (novel) (uncredited)". The story is that producer Val Lewton didn't like the title, or the story on which the film was to be based, so he instructed his writers to use Jane Eyre as a basis for the story. (Wikipedia lists I Walked with a Zombie on its page dedicated to "Adaptations of Jane Eyre".)
Frances Dee plays a nurse from Canada (she's the Jane Eyre stand-in, I guess) who takes a job caring for a woman (Jessica Holland ... Mr. Rochester's wife?) who lives on a Caribbean island. The woman is a "zombie" due to a fever she acquired ... she has no willpower of her own, so she needs full-time care. There's a romance involved (the nurse falls in love with "Rochester"), and a backstory that explains that the Hollands brought slavery to the island. The treatment of zombies is intriguing. For the natives, voodoo is a part of life, and to some extent, the film adopts this stance. There is a careful refusal to come down on the side of either rationalism or mysticism. The supernatural elements might be "real" ... they might be brought on by the Holland family's connection with slavery. This, combined with the smart use of shadows, make for an atmosphere full of portent, all done on a tiny budget. While the acting is adequate, that atmosphere is what puts I Walked with a Zombie among the classics of horror. And it's all done in 68 minutes.
It should be obvious that this is not a typical zombie movie. It's easy to understand why Lewton didn't like the title. #580 on the They Shoot Pictures, Don't They list of the top 1000 films of all time, 8/10.