Lieutenant (Navy) René Stroffer has developed an amorous passion for Gaby des Roses, a dancer loved and adored by the crowd. Gaby is flattered by the love of the young man and does not remain insensitive to him. As for Lucille, René's fiancée now neglected by him, she feels forsaken and miserable. After signing for an American tour, Gaby chooses to travel on the transatlantic liner Jupiter because René is an officer on board. But the ship is commanded by Captain Stroffer, René's father, who strongly disapproves of his son's affair with Gaby... During the crossing, one evening at dinner time, a fire starts in the hold and soon spreads and becomes menacing. Captain Stroffer wants at all costs to prevent panic among the passengers. René has an inspiration: he asks Gaby to dance for them until danger is no longer any danger...