I Walked with a Zombie (1943) Frances Dee, Tom Conway, James Ellison

A nurse is hired to care for the wife of a sugar plantation owner, who has been acting strangely, on a Caribbean island. Young Canadian nurse Betsy comes to the West Indies to care for Jessica, the wife of a plantation manager Paul Holland. Jessica seems to be suffering from a kind of mental paralysis as a result of fever. When she falls in love with Paul, Betsy determines to cure Jessica even if she needs to use a voodoo ceremony, to give Paul what she thinks he wants.