Evie O'Neill, after taking down a supernatural serial killer, becomes America's "Sweetheart Seer," but is not much loved by the other Diviners--especially Henry DuBois and Ling Chan, two Diviners trying to keep their powers to walk in dreams secret. When a mysterious sleeping sickness takes New York by storm, Henry and Ling find themselves at the forefront of the battle against the mysterious, nightmarish man in the stovepipe hat who seems to be the cause.