When Tim Lanken is convicted of rape and murder, he leaves behind his girlfriend Rachael and new baby daughter Sarah. Six years later, Tim's brother Jake invites Rachael on a ghost hunt aboard his new boat. Rachael's older sister Lisa invites herself along. Paying passengers are to experience ghosts first-hand on board the weekend cruise.

The next morning, everyone has disappeared from the boat, except for Rachael, Lisa, and Sarah. Strange things occur around them, and two men dressed in black seem relentless to cause them harm. As things escalate, Rachael is enlightened with the truth – the other passengers haven't disappeared. Her family has.