Eighteen-year-old Mahi Sharma has no idea what the world was like before Lucifer slew the angels and laid waste to humankind. For two years she's been feeding demons her pain and fear in a human containment prison. But, Mahi has a precious secret. One that, to save the life of a friend, she must reveal against her wishes. Now, with her ability exposed, Mahi's only option is to escape before the demons can take her to the dark king himself.

Life beyond the prison is a wasteland inhabited by flesh-eating creatures. Once she's free, Mahi spends every moment struggling to survive. When Kavon, a half-angel, half-demon hybrid, rescues her, they discover a supernatural bond linking them, but he isn't the only one. Isra, a prince of Hell, relentlessly plagues Mahi's consciousness, claiming to know what she is. Isra has a plan of his own, and he will stop at nothing to see Mahi seated on Hell's throne.

When demons capture Kavon, Mahi discovers Lucifer is transforming humans into an army of abominations to find her. It's no longer only her life at stake, and Mahi has no choice but to ally with the devious Isra and head to Morningstar city. They must save Kavon and stop Lucifer before Mahi becomes another tool in his dark games.