Things to like about this story: A cute take on the Cinderella story; the Doctor actually factors into the story, which is not the case in most of the Time Lord Fairy Tales; the not-so-much-glass slippers are a nice tweak to the tale.

Things not to like: There's no explanation as to how or why the Doctor picked this particular person for his mission; he doesn't warn her about the danger he is sending her in to face, or the consequences of not following his instructions.

I can see reading this to a kid who likes Doctor Who and already knows the Cinderella story.