Raised by a half-mad mother who dabbled in magic, Morwenna Phelps found refuge in two worlds. As a child growing up in Wales, she and her twin sister played among the spirits who made their homes in industrial ruins, but her mind found freedom and promise in the science fiction novels that were her closest companions. When her mother tries to bend the spirits to dark ends with deadly results, Mori is sent away and must try to come to terms with what has happened without falling prey to the darkness.