The luxury transatlantic liner Cassandra, chartered by a little-known travel company, takes a sea cruise from Havana to Bermuda. On board more than a thousand passengers: Italians, French, Americans, Russians, Germans... They all enjoy the journey, soak up the sun, swim in the pools, play pool, chat, drink in the bar... And only a few of them much here seems strange: none of the guests of the ship has ever seen the captain, his assistant calls inaccurate coordinates of their location, the representative of the travel agency accompanying the first class passengers mysteriously disappears...