Death Cruise(1974)

Death Cruise is a thriller that traps unsuspecting couples aboard a luxury ocean liner. The winners of what they believe is a dream vacation soon discover the cruise is a deadly trap—they've been lured onto the ship to be systematically murdered. As paranoia and suspicion grip the passengers, they must uncover who orchestrated the scheme and why they were chosen. Isolated at sea with no escape, the couples face a race against time to survive the night and expose the killer's identity before they become the next victims.