Elegy by Tara Hudson
Series: Hereafter #3
A stalker ghost, misguided Seers, and spellbinding wraiths—Amelia Ashley has faced them all. Now her greatest hope is to spend the rest of her afterlife with her living boyfriend, Joshua. But the demonic forces return to give her an ultimatum: turn herself over to the darkness or watch them murder one living person per week until she does.
Amelia fears she might really be doomed, until the forces of light give her another option. She can join them in their quest to gather souls, with a catch: Once she joins them, she can never see Joshua again.
Faced with impossible choices, Amelia decides to take her afterlife into her own hands—and fight back.