Emerging from the dregs of society to become a celestial warrior, Eos soon becomes immersed in a world of ancient texts and falling angels, tasked to find the sacred Book of Raziel and stop a war in heaven. The secrets of the Book will lead Eos down a path of betrayal, pitting her against those she loves. All the while she must cling to her own crumbling sanity as her psyche is split by the emergence of another entity, heralded by the onset of Eos' new powers. Soon, Eos finds herself in the clutches of the Master of the Oceans, where she must convince him to give her the sacred book. His price? Her soul.