This book answers a fundamental question: what do all these important people do (king, president or prime minister), to be always so busy?

The castle is full of green monsters hiding under the flaps. They are all very nice except for two, which have teeth and bite (be careful of your fingers!).

All the green monsters come from the magician, who has himself turned into a green monster.
He has lost his old book of magic spells and is desperately trying to figure out the potions which used to make him so powerful.
But his memory plays up. Whatever he does, he always produces the same potion: the one which changes everyone into green monsters.
In the princess’s room, under the bench, there is a green monster who is desperately in love with the princess. Before drinking the magician’s spell, he was the most handsome prince in the region.

The princess is the king’s daughter; nevertheless, she’s a mouse and he’s a cat! How is that possible? It’s because the queen, whom we don’t see in the book, is a mouse. And the daughter is the spitting image of her mother; and not at all like her father.

And why doesn’t the cat king eat mice? Look into the castle’s kitchen: the king’s meal is being prepared: he only eats vegetables! The king doesn’t eat mice because he’s vegetarian.

It’s a book which children love. A game book, but not only. There are many other paths to explore. For example, it makes it possible to desecrate power. Whether we’re small or powerful, we all basically resemble one another.

The beginning is very important: "You go to see the king to tell him all that’s wrong". From there, you can ask the child what’s wrong in the world, talk about it, and point out that it’s high time the king did something, otherwise why is he the king (or president or prime minister)?