Shadow of Oz - Nick Damon
Unofficial sequels are hit or miss for me. The premise of this story intrigued me - Dorothy coming back to OZ years later to help her friends - but the story didn't quite hit the mark. The story seemed to rely more on action than character development, as though relying on the probability that we are familiar with the movie/original books.

It was an okay story, it just did not work for me.