Immortal Light: Into Shadow (Book 2‪)‬

Having been introduced to the ancient and magical power of the Immortal Light—a power derived from Zharem, the lost city of gold—Lucy Higgins finds herself in more danger than she ever could have imagined. When Lucy's best friend, Kat, is kidnapped and tortured by evil agents of the Immortal Light, Lucy is forced apart from Benjamin—her soul-mate and mentor in the Immortal Light—and away from Oregon, headed for an ancient, hidden city over the water called Aeterra. Her guide to this virtual Atlantis is a Zharemite warrior named Sean. While she hardly knows Sean, Lucy is left with no choice but to trust him. If Lucy can manage to avoid capture or death, she might be able to fulfill her mission in finding the new queen of Zharem.