Amber (The Witches of Oz #3)

It's happened again. Two Cardinal Witches are now gone. This time at the hands of a new young girl, summoned from another distant land by the "Wizard." Solana, Witch of the East, was crushed by the girl's house falling from the sky. This cannot stand. If the girl is permitted to live, surely she'll bring an end to another of Pastoria's witches. Something must be done. Zephyrine, Witch of the West, must discover a way to stop the girl from reaching her kingdom and getting closer to Ozma, the true ruler of the land. From poisonous plants to all manner of bird and beast, Zeyphyrine will stop at nothing to put an end to the girl and her ragtag group of allies. It falls to her and her remaining sisters to keep Ozma safe, and help her reclaim her rightful place upon the Emerald Throne.