It seems like they just keep bringing the White Witch back no matter what. I guess they just think she was soooo good of a villain (though I don't think she was) that they need to incorporate her into every film. bah.

You're right about the plot problems, though. Voyage is just that - a voyage. they sail, they find stuff, they move on. The only goal is finding out what happened to the lost lords and finding Aslan's Country.

I don't think it will work as a mystery....