César runs a bar along Marseilles' port, assisted by his 23-year-old son, Marius. Friends since childhood, Fanny and Marius love each other, but Marius has a secret wanderlust: every ship's whistle stirs a longing for foreign lands. When M. Panisse seeks Fanny's hand in marriage and when a departing clipper needs a deckhand, Marius and Fanny must decide who and what they love most. César, with his generous, wise spirit, tries to guide his son.