In the early 1950s, on the banks of the River Marne, François, a young 11-year-old boy, is intrigued to discover that his parents are building a boat in their little garden, a replica of the famous sailor Joshua Slocum’s sailboat. As the years go by, in post-war France, François drifts from adolescence to adulthood. While the boat is being built, and with a tender and poetic look at his mother and father, the young boy embarks on his own adventure, one that will take him down his own passionate route of the sea and drawing.