Willow Haywood has always been trapped between the worlds of the Light and the Dark. Her waking hours are plagued by her ability to feel the emotions of those around her. No matter how inward she draws, she cannot shut out the feelings of others. Sometimes she will see images - echoes of other people and places - that she can enter to influence the emotions of people she has never met.
By night, Willow experiences her only escape from this terrible insight - entering into the world of dreams. Most of these dreams are shared in blissful silence with a stunning blue-eyed boy. But every new moon she lives through something much darker: a horrific nightmare shared by another mysterious boy who is always shrouded by shadows.
One night, this shadowy figure invades her dreams outside of his appointed time. In this new nightmare, Willow is marked; a mark which follows her into the waking world and sets her on a momentous path through light and darkness, through fragmented myth and half-truths, through past lives and disturbing family secrets, all in the face of the ever-dominant Zodiac. What she finds will endanger the lives of those closest to her and will force her to make a decision that will change her world forever.