Atlas (The Atlas Series) (Volume 1)

Every four days. Commit one act of atrocity. Keep the balance or the planet dies. Thrown into a reality she never could have imagined, Kala Hicks is pitted against the forces of good and evil. She must choose whether to save the world by doing the unthinkable, or sit back and let it burn. And four days later, she’ll have to do it again.