Roumanian sea captain, Josef Maresciu, has accepted on board his ship a passenger named Vlad. All goes smoothly at first but gradually the captain comes to realize he has put himself, his crew and his ship in mortal danger. Vlad uses his powers of darkness to control the ship's direction and the captain's authority. As the ship (the Demeter), sails closer to England, Vlad takes over and leaves the captain with just enough strength to dictate his story...