On the first day of this term, Martin's father gives him a gift. It is a book without any pictures in it. His father says, "Son, it's a magic book, But to find its magic, you'll have to read it."
Martin doesn't like reading. But he starts reading it because he likes things about magic. The next morning, his father asks him, "Have you found the magic key?" So there is a key to find. Martin looks through the book, but there is no key. He stops reading the book because he thinks his father is trying to trick him into reading. A little later, his younger sister asks him for the book to try reading it. After several days, she screams (尖叫) happily, "I've found the key of the magic book!" And she can talk about all the worlds and places she has visited with that magic key.
That makes Martin interested in reading the book. At first it is difficult, but, little by little, he is interested in the adventures (冒险) Suddenly, he finds that book itself is the key of magic! His dreams are filled with adventures.
However, Martin is so happy because he can see a new key to a thousand worlds and adventures after that. With the key, Martin can travel in those books forever.