Aster Shoreland is brilliant, snarky, and barely keeping it together. Every day, she's forced to interact with the worst person alive: Kol Han. At the University of Chicago, survival used to mean acing finals, but after a party at Kol’s fraternity l goes horribly wrong, for Aster it now means resisting the urge to rip out her classmates' hearts. When her roommate Jessica Sangwine vanishes from a party at the mysterious Shadow House, Aster is thrust into a nightmare of blood and ancient magic. Drained to the brink of death and turned into a fledgling vampire by her arrogant lab partner Kol Han, Aster discovers she carries a rare, cannibalistic "blood sickness" that threatens to transform her into a feral predator. As the hunt for Jessica unearths a dark family legacy and a vengeful spirit tied to the very origin of vampires, Aster must race against a looming Black Moon to find her friend before her mounting insanity, and the insatiable hunger in her chest, claims what is left of her humanity.