Awesome! The first book is called "It's time, Cassandra Klein" By Karren R. Brookes. It's about this girl who has a supposedly mental father and a mother who left when she was born. When she turns 13, she recieves this necklace and gets transported to another world which she finds out is her mother's and she finds out her past. She is set to find her mother and more information, and she has a lot of obstacles in the way. It's really good and has very comical characters :)