is probably the best book in the Narnia series. I suspect it's not quite as popular as Wardrobe
(and the sappy movie adaptation didn't help either, but Narnia's movie adaptations are all pretty awful), but I think it's on par with it, if not better.
There's not really a plot or central conflict in the novel; the central conceit (searching for a bunch of missing Lords) is a bit of a MacGuffin, as they're not really that important to the story anyway. What's cool is the elaborate fantasy worlds Lewis creates. There are some brilliant ideas at play in Dawn Treader
- both narrative and psychological - and the subtext about human greed isn't overplayed at all.
Out of all the Narnia books, this was the one I wanted to live in the most. In the world of fantasy literature, that spells success for Lewis.