Before twelve-year-old Megan Blayne moves to Hollow Mountain, she believes that nothing can ever come between herself and her twin sister, Cate. Even though they have different personalities, they are forever bonded by blood and wear matching green amber rings. But just as myths about peculiar happenings around the town begin to overwhelm their daily conversations, Cate?and her ring?suddenly disappear. After Megan embarks on a desperate search to find her twin, she is met by a mysterious serpent who opens his mouth and drops Cate's ring at her feet. But as quickly as the snake appears, it disappears, along with the ring. Terrified and more worried about Cate than ever, Megan sets out on a daring adventure in a fantasy world more dangerous than she ever imagined. As she begins unraveling a complex puzzle that she hopes will lead her to Cate, Megan encounters a strange boy, an evil lord, and serpent people who will do anything to get the one thing they want most. In this fantasy novel, a girl on a quest to find her missing sister must rely on help from an unlikely new friend as she attempts to save two worlds from a terrible fate.