Possessed

Finding the gate to the otherworld. Stealing a soul from hell. What could be easier? But people rarely return from such a journey. However, Alex Stern is determined to rescue Darlington from purgatory, even if it jeopardizes her future at... Lethe and Yale University. Having received a direct prohibition on saving her mentor, Alex and Dawes cannot turn to the members of the Ninth House for help, so they decide to act on their own peril. Together with allies, they are forced to uncover carefully guarded secrets of the society and in the process break all established rules. But when professors begin to die, Alex realizes: this is not just a series of unfortunate events. Something deadly is happening in New Haven, and to survive, she must face not only the monsters from her past but also the darkness lurking within the university walls.
 
Series:
Ninth House
Possessed