Tension on Deck: Death on a Luxury Liner. Photographer Carolin is documenting the complicated transfer of the luxury cruise ship Poseidonna from the shipyard along the Ems River to Holland for a magazine. The young woman is excited about the attractive assignment, but suddenly her colleague Leif disappears. Why is the shipyard management uninterested in finding him? No one can leave the ship - not even Carolin, who embarks on a dangerous search. Wind, weather, stowaways, and dark dealings.