Transatlantic flight 713 is in trouble because the pilot and crew are poisoned while flying above the ocean. Now the passengers have to take control to save their lives.
A mysterious man under the name Mister X performs in the circus, playing violin on a chair suspended in the air by ropes. His breathtakingly sad melodies reflect his internal turmoil - he's in love with a noble lady and this relationship is frowned upon in their society.
The captain of one of the fishing seiners in the Far East, having accidentally discovered a large school of fish, did not notify the other crews, contrary to established traditions and regulations. The "race" in the ocean caused the accident, and now the gathered comrades intend to understand the sincerity and heroism of their colleague.
