Twelve-year-old Penny has never had a normal life. After her grandmother suffers a stroke that puts her in a nursing home, Penny is forced to move away to live with a father she has never met. For years, her grandmother refused to speak of her father and Penny has no idea why. Now, as she makes new friends and gets comfortable in her new life, Penny discovers a secret cave nearby. Eager to uncover the secrets of its winding passages, Penny...