In the gripping third volume of Christelle Dabos's best-selling saga, Ophelia, the mirror-travelling heroine, finds herself in the magical city of Babel, guarding a secret that may provide a key both to the past and the future. After two years and seven months biding her time on Anima, her home ark, it is finally time to act, to put what she has discovered in the Book of Faruk to good use.