Chasing a vision that links his shameful past with impending doom, Angel reluctantly uses the time-travelling power of Fred's alternate form, the goddess Illyria. Not quite sure what will bring changes to the future with only pieces of Angel's vision to guide them, they find themselves aboard a cargo ship on the high seas. With Angel's past self, Angelus, and his vampire companion, Darla, aboard the ship, Angel and Fred try to keep hidden as Angel begins to remember this voyage that was filled with slaughter and held a mysterious treasure that sank to the bottom of the sea along with the ship.