Alex Stern made it to hell and back more than once, but this time she left the door open behind her. Demons are creeping through the streets of New Haven and the Yale campus, feeding on the souls of the living, terrifying the dead. Alex and her allies can hunt them, but it's only a matter of time before the gates to the underworld spring wide and they face a war they cannot win. To stop it, they'll have to reach deep into the secrets of Yale and its societies, and discover the truth hidden in Alex's own blood.