On a remote island in the Caribbean, Betsy Connell, a nurse from New York, arrives with the mission of caring for the deranged wife of a sugarcane planter, Paul Holland. The woman, known as Vera, is in an almost catatonic state, caught between life and death, awakening in Betsy a mix of curiosity and compassion. As Betsy delves into the mysterious atmosphere of the island, she discovers that the inhabitants are influenced by ancestral voodoo practices and terrifying superstitions.
The relationship between Betsy and Paul complicates when the nurse begins to unravel the dark secrets surrounding Vera and her strange condition. Influenced by the supernatural environment, Betsy becomes obsessed with the possibility of saving the woman, delving deeper into the voodoo rites that seem to play a key role in her state. However, the shadows of the past threaten to consume everyone involved, and Betsy finds herself torn between her professional duty and the love she is starting to feel for Paul.
As the tension mounts, Betsy faces moral dilemmas and unexpected horrors, revealing that true terror does not always come from the creatures of the night, but from the secrets that people keep. In a chilling climax, the line between life and death blurs, turning her quest for redemption into a desperate struggle for survival.