Persephone Green doesn't have a heartbeat. In a country where the dead has eerily lurked among the living for nearly two decades, even she knows its absence is not normal. In place of her heart, something inhuman stirs, an ancient ocean she discovers twinned in the chest of Sebastian, the charmingly bizarre new student. When they're together, they attract ghosts like a beacon, and when they kiss, white flowers bloom in the dead, autumn ground. To exhume the truth, Persephone and Bas travel across the Midwest to the deserted facility where it all began. Pursued across state lines by writhing swarms of ghosts, militant government agents, and-maybe worst of all-her mother, they unspool a tangled web of conspiracies. At its center: a divine and devastating truth. Forced to choose between an imperfect life that's wholly hers or an otherworldly responsibility older than time, the echoes of Persephone's decision will alter the fates of all souls-living and dead-forever.