The captain of the tugboat Cyclone, André Laurent, rushes off to save the Mirva. He abandons his sick wife Yvonne and the couple celebrating their marriage. In the early morning, the Cyclone tugs the Mirva ashore with Catherine aboard.
The wife of a mechanic and former fighter pilot falls in love with the idea of flying herself. This soon becomes an obsession and she undertakes a lofty feat: the longest solo flight ever made by a woman.