The Ozite Cycle- Thea of Oz

Hundreds of years have passed since Dorothy first went to Oz. Since then, global warming has caused devastating storms that strip our world and dump the detritus on Oz, including the occasional refugee. Thea is one such traveler, and she's been on Oz since she was a young child. Little does she know that she is in fact the direct descendent of the fabled Gale girl, which has just come to the attention of the green-skinned Minister of Trade. Accompanied by her disdainful cat Mrow, Thea must confront the villainy that her ancestors fomented all those years ago.