The Ghost Breakers (1940) on Netflix

Mary Carter inherits her family's ancestral home, located on a small island off Cuba, and, despite warnings and death threats, decides to take possession of the reputedly haunted castle. She is joined by radio broadcaster Larry Lawrence who, believing he has killed a mob gunman, flees New York with his butler, Alex. Once on the island the threesome enter the eerie castle and after viewing the ghost of one of Mary's ancestors and fighting off a menacing zombie, they find the key to the castle's treasure but are interrupted by an all-too-human foe.