This book is for children aged 6 to 9 who have ambitions to succeed and understand that learning foreign languages is essential for this. The challenge is to do this without overexerting themselves. By reading this book, young readers can discover the story of Jean-Charles. During one summer, he learned Dutch, was exempted from his summer job, received recognition for his achievement, and played a clever prank on his father. The book is specifically designed for children who can already read independently.