Click on a thumbnail to go to Google Books.
Two Moon Princess (edition 2010)
Two Moon Princess by Carmen Ferreiro-Esteban
References to this work on external resources.
Wikipedia in English
No descriptions found.
Andrea, a reluctant, tomboyish princess from the Kingdom of Zeltia--a world resembling medieval Spain--is transported from a forbidden cave into modern California, and when she accidentally returns to her home with the wrong person, it sets off a chain reaction that threatens her family and their kingdom.
(summary from another edition)