I remember seeing a movie of this book as a kid and now I've finally read half of it. It is really the first Oz book I've ever read and I chose it because it was the one where the Wizard first came. A prequel should be read first, I guess. While the beginning was kind of abrupt with the Lion immediately becoming the Witch's servant in collecting the Flower of Oz, it does make sense since no one else would do it. It is the saddest thing to see that such a brave lion would turn into the Cowardly Lion and that the Wizard never recognized his dear friend ever again.
I'm a bit under the weather, but the book is an easy read.