In five days, it's Father's Day and Marie-Lou has no present. The marmoset she made at school is a failure. Her other ideas are too difficult to realize. And her piggy bank is hopelessly empty. But Marie-Lou is determined to give her dad a beautiful, surprising and original gift. A gift he will never forget. And when Marie-Lou has decided on something...

In class, Marie-Lou has a terrible teacher, and an even more terrible problem: acute dunces from birth. In short, she is last in everything. And now her parents are threatening her: if she doesn't get the average in her third term exams, she won't be going on holiday! Fortunately, Marie-Lou has no shortage of imagination to get out of this predicament...

The day Marie-Lou sees her mother take out her suitcases, she jumps for joy: "Hurray, we're going on a trip! "Unfortunately, her parents are invited to a conference in Italy, and they have no intention of taking her. She will go to a camp in the meantime. Camp? Do they want to get rid of her? Marie-Lou roared and stomped her feet, but it didn't matter, she was going anyway. No sooner had the bus started than she had already taken a dislike to everything: the director, the other children, their hats and their songs. Marie-Lou has made up her mind: it won't happen like that!