Celeste Glass is a killer. She's cold, ruthless and deadly, a killer of both supernatural and preternatural creatures. These beings are known as Shadows; the Shadow of the Dark World. However more greater and horrifying than the rest are the Demons- Celeste’s personal enemy; responsible for gruesome murder of her mother and little brother. Possessing demon powers herself, Celeste makes it her life mission to hunt down and kill the Demons in her way. Especially the mastermind behind the murder of her family. In her way however is the Shadow Sect, a secret and by far the largest organization of rouge Shadows. Their cunning leader will stop at nothing to capture her and the fractions of Demon blood that flow through her veins. Soon enough Celeste finds herself with her own ragtag team of allies against the Sect. But put there is a much more darker force after Celeste. They want her, want her power. What she has is a terrifying power that they don't, one that they will stop nothing to have. Something worth killing for. They want the demon within.