This is awful! C. S. Lewis was clearly out of ideas when he penned this story (which seriously makes me doubt I'll ever read the other 4 books in the saga—especially now that there probably won't be any more films). Just like the Dawn Treader, the story wanders aimlessly for most of the book, occasionally placing the crew in lame, horribly explained situations, and just enough peril so that Jesus Aslan can deus-ex-machina into the story.
Lewis still has that awful habit of randomly breaking the fourth wall and talking to the reader about things that add nothing to the narrative; and also his other, despicable knack of shoddy explanations to get things out the way. I especially loved how he kicked Susan and Peter out of the story: Susan, the pretty but stupid one, would be the one who “would get far more out of a trip to America;” while Peter had to study for a test (I guess those A-levels really are hard) and was being coached by Professor Kirke (Remember him? Now he's poor and no longer living in a mansion. Tough luck). It's clear that Lewis is no good with consistency and character development. I'm really not looking forward to reading any more of his work.
I think this piece of writing summed it up best:
“Do you mean to say,” asked Caspian, “that you three come from a round world and you’ve never told me! […] Oh, I’d give anything - I wonder why you can get into our world and we never get into yours? If only I had the chance! It must be exciting to live on a thing like a ball. Have you ever been to the parts where people walk about upside-down?”
Edmund shook his head. “And it isn’t like that,” he added. “There’s nothing particularly exciting about a round world when you’re there.”
That's right, Edmund. There's nothing particularly exciting about Narnia when you're reading about it.