Barbara Andrews, Lynda Day George and her husband Larry Andrews, John Saxon, travel to a small island off the Philippines where they are meant to move into a condominium that, upon arrival, doesn’t exist. Their business associate Del Giorgio, Michael Dante, reveals he has arranged instead for them to live in a large, historic colonial mansion named Casa Fortuna. He adds that the home is tied to a local legend: Alma Martín, Janice Lynde and her husband Esteban, Zitto Kazann, supposedly killed each other there after Alma grew entangled with the occult. The couple is unsettled but agrees to stay, drawn by the promise of a grand new life.
Barbara begins to be awakened by chanting and is plagued by visions of Alma. In a startling moment, Barbara stabs herself in the hand, though she tells Larry it was an accident. She is hospitalized, and Dr. Frank Albanos, Mario Milano, runs tests to understand what is happening. Meanwhile, Larry meets their neighbors, Leia Solomon, Anne Marisse, and Leia’s father, Dr. Solomon, David Opatoshu, a healer who senses danger and believes Alma is vying for Barbara’s body. Leia and Dr. Solomon warn that Alma’s influence is growing stronger, and they urge Larry to seek help before Barbara slides further under the mansion’s dark pull. The tension deepens when Larry discovers that the records of Barbara’s tests have vanished, hinting at a cover-up or something more sinister behind the haunting.
Leia undertakes cleansing efforts around the house while Larry and Barbara are away, but Alma’s spirit confronts her and electrocutes Leia to death, reducing her to dust. The investigation intensifies as Barbara’s situation worsens: a strange skin anomaly appears on her finger, and Dr. Solomon confirms that Alma is trying to infect Barbara in a terrible possession. With this warning, Larry contemplates moving away, but Barbara resists, clinging to the life she has left. The next morning, Del’s body is found on the hillside near Casa Fortuna, suggesting that the mansion’s curse has claimed another victim and raising the stakes for everyone involved.
Desperate to save Barbara at any cost, Larry turns to Dr. Solomon for help. They attempt to stage an exorcism, hoping to sever Alma’s hold, but Alma—still clinging to Barbara as a host—manifests with increasing menace. She threatens to take over completely, and a dramatic confrontation ensues as Dr. Solomon separates Alma’s spirit from Barbara’s body. The act exposes Alma’s life-draining power and leaves her unable to sustain a full rebound. With Alma defeated and Barbara herself finally free, the couple leaves Casa Fortuna behind for good, choosing to start anew away from the mansion’s lingering shadow.
