The Middle Ground by Nadia Aviles

DAVID befriended the ghost in his graveyard. He gave her the name Ghost when she could not remember her own. The two quickly became inseparable, even by death's pull, which had begun to wear heavily on Ghost’s mind. They swore they would fight to keep each other. David promised he would risk all to bring her back—back to life, back to him. But how far were they willing to go? What torments would they endure? What impossible tasks would they strive to accomplish? Into The Middle Ground—the “limbo”, the ‘half world,’ home to neither the living nor the dead—is where David must fall in order to save the girl he met in his graveyard all that time ago, and who has somehow become his only anchor in an upside down world