Zombi Child

Zombi Child is a 2019 French drama movie written and directed by Bertrand Bonello, based on the story of a supposed zombified man in Haiti, Clairvius Narcisse. The movie premiered in the Directors' Fortnight section at the 2019 Cannes Film Festival.
Plot.
In 1962, a Haitian man is buried alive by white colonists, only to be brought back as an undead zombi slave. 55 years later, Fanny, a teenage girl starts a friendship with Mélissa, who moved from Haiti to France after the 2010 Haiti earthquake. After discovering that Mélissa's family is associated with voodoo culture, Fanny convinces Mélissa's aunt Katy (a mambo) to make a ritual to cure Fanny's heartbreak over a recent breakup. The ritual goes wrong and Fanny is possessed by Baron Samedi himself.