Two decades after surviving a massacre on October 31, 1978, former baby sitter Laurie Strode finds herself hunted by persistent knife-wielder Michael Myers. Laurie now lives in Northern California under an assumed name, where she works as the headmistress of a private school. But it's not far enough to escape Myers, who soon discovers her whereabouts. As Halloween descends upon Laurie's peaceful community, a feeling of dread weighs upon her -- with good reason.

A luxury cruise liner is requisitioned by the Greek government in an attempt to give safe passage to national treasures worth millions of pounds. The liner is attacked by an art collector who finds out about the plan. During the hijack the liner sinks to the sea floor and so begins a fight for survival as the remaining air begins to run out.