In the week leading up to Halloween, travel agent, Yvonne Suarez, takes a vacation bringing along her eight-year-old daughter. Her close friend, David Ludlow, and his nephew take the stateroom next door. While Yvonne wonders how David will get along with the kids, and whether to take their relationship to the next level, she's distracted by disturbing vibes picked up by secretive passengers.
Jamaican Psychic, Mumma Katrina, scheduled to tell fortunes for fun as part of the Halloween festivities, can't help but be drawn to Yvonne. She warns her that she is meant to stop an evil darkness. Yvonne tries to deny the bad feelings appearing on her own radar but then the buxom girlfriend of the has-been actor, seated at the Captain's table, is poisoned. As David expects, Yvonne's natural curiosity draws them to investigate the cause, and they soon discover an evil obsession that leads to murder, eventually putting Yvonne and her loved ones in jeopardy.