"Tistou les pouces verts" by Maurice Druon is a wonderful story. Still one my favorites, and my childhood is far behind me, haha.
If you want to read easy French children books, I would sugest the Barbapapa albums. They are very thin, on various topics : La ferme, La musique, Les formes... but there is not much to read because it's for children when they start reading, pictures are big!
They belong to the French culture.
If you want to read, I would recommend Façon de parler 1, French coursebook : it's a book to learn French with lots of dialogues in pictures. It is really made for absolute beginners. And there is a love story in it![emoji]