In this book, for once, the narrator is not a person, nor an animal. She is not really an object either, even if she spills out onto a sheet of paper, a young student's paper in the middle of a dictation, because she is a stain. And the stain speaks, the stain tells its story and says how sad it is that it is never welcome, not at school, not on a piece of clothing, not at work. Until our heroine finds herself by chance among other stains, of different colours, on a painter's canvas. And everything will be transformed!