Alice is a 30 year-old sailor, in love but unmarried. While her companion Félix waits for her ashore, she sets off as second mechanic on the Fidelio, an old freighter. On board, she discovers not only that she replaces a recently deceased mechanic, but also that the Captain is none other than her first great love, Gael. In her cabin Alice comes across the diary of the former mechanic, and by reading its content –accounts of technical problems, sexual conquests and lovelorn emotions – she finds, oddly, that they echo her own journey. As the ship calls on various ports, Alice deals with life aboard with an all-male crew and the swings of her romantic feelings, while trying to stay the course.