Simon has a recurrent dream: he discovers a fabulous and quiet world where live all the animals that have vanished over the centuries or have been extinguished by Man. To Simon, this dream is so real that he is convinced this world is accessible to him. And he must have access to it before he gets bigger as only children are allowed. Witty schemes must be thought of as if adults get in the way, the dream won’t come true and he will have to start the process all over again. When Simon and his friends finally make it, what awaits them? This is a well-kept secret they swear to keep for as long as they live.