An Untold Adventure

This story takes place a few months after Prince Caspian (in our world, that is), and a year or so before the Voyage of the Dawn Treader. Six people get into Narnia (they've all been there before) - but how?
What if someone told you that you could enter a world filled with magic, talking animals, witches and wizards, what you say? You'd probably tell them that their crazy, and they need to see a doctor about it. But it's not true! Because, well, I've heard about that place...and I know actual people who have been to That Place... The most wonderful place in the world... But, really, it's not IN this world. It's an entirely different one! In fact, it's an entirely different universe! And, in That Place, there actually IS magic, talking beasts, and witches and wizards. But you don't have to take my world... You can just open up many, many different books yourself! And, you most likely, will enter that world. But it will happen when you're least expecting it...