For Nikki Donovan, being a teenager can be hell. Literally.Nikki didn't thinks her life could get any more complicated after she moved to the dreary town of Erin Heights - fitting in at a new school while navigating the social scene was stressful enough. But when her sixteenth birthday rolls around, she's visited by a mysterious stranger, Michael, who tells her that her long-lost father is actually the demon king of the Shadowlands - the dimension that protects our world from the Underworld and Hell. Maybe it's because she's in shock, or maybe it's because Michael is seriously cute, but Nikki follows him into the Shadowlands. There she learns about her half-demon powers, about the potential war between the Shadowlands and the Underworld, and that her father wants her to assume the throne - forever. Not to mention that her growing crush on Michael is completely forbidden.... Ruling the kingdom, navigating a secret crush, and still making it home by curfew - what's a teenage demon princess to do?