You already know this type of book in which you are the main character.

You're pedaling quietly down the street when suddenly... two of your friends are kidnapped by men wearing large hats! Who are they ? Why did they kidnap Sarah and her little brother? Mystery...

You decide to go looking for them, but the land is big and you don't know where to go. Fortunately, mysterious friends are watching over you. Follow their advice, show intelligence and insight, and you will be able to thwart the many traps that the hat men have set your way. After a long and perilous journey, you will reach this island inhabited by the people with golden eyes. And you will know the astonishing legend of this island unknown to everyone!

But it is also a useful book.

At the end of your trip, you will know the French language much better. Synonym, homonym, prefix and suffix will no longer be barbaric terms. You will know how to discover the meaning of unknown words by thinking about the sentences in which they are found... and all this while discovering the legend of the island with golden eyes!