Books in The Four Keys series

"...You must find the four Keys to keep our worlds from burning... "No one is who they seem...... Magic and mayhem are around every corner. Andie didn't expect to be orphaned. Now she has no parents, no Nan, no one but Anne, the weird social worker who carries on conversations with old books and empty purses. Anne takes her to a small town in Texas to live with her new guardian, Celeste, an eccentric figure among many there who seem to know something that Andie doesn't. One evening, the woods behind Celeste's house spirit Andie away, and she discovers a secret so incredible that she can scarcely believe it. Her destiny is to find the four Keys that will save the Tuatha de Danann from annihilation. Worlds collide when two of her new friends from school, the sweet, helpful Teagan and the rude bad boy Hunter, join her on her journey to reach the mysterious place known only as Finias in search of the first Key, The Sword of Light. As they flee the wicked Fomorians and battle with the Witch Freya, Andie and the boys forge new alliances and make more adversaries. Will Andie and her friends rise to the challenge, or is the magical realm as good as gone already?