In northern France, Juliette grows up alone with her father, Raphaël, a veteran of the First World War. Passionate about singing and music, the lonely young girl meets a magician one summer who promises that scarlet sails will one day take her away from her village. Juliette never stops believing in the prophecy. Freely inspired by the tale "The Scarlet Sails" by Aleksandr Grin, Pietro Marcello's film blends music, history and folklore, bordering on magical realism.

　　故事围绕两个13岁的男孩展开，他们的关系长久以来非常亲密，但同学之间对他们的关系产生猜忌，使他们不得不分道扬镳。而当一场悲剧发生时，其中一个男孩被迫面对他为什么与他最亲密的朋友疏远。