Ebony has spent the last two hundred years trying to escape the Underworld, because who she is doesn't match what's in her heart. Being a demon that has a pure heart is unnatural, and those around her, mostly her family, want to keep her imprisoned for the rest of her life. While escaping, she saves an angel imprisoned in the Underworld and the course of her entire life is change from the moment she meets the mysterious angel, Simon. With the help of the Promiscus Guardians, and their lesser known subgroup, the Underground Guardians, Ebony is set on a path that will lead her to discovering the true depth behind her power, the value of her pure heart, and a life worth living. But will her undeniable connection with Simon lead to her undoing?