Jemma Warren's Ghost - Limerence Duology, #1

Jemma Warren's gift of spirit seeing has branded her unremarkable in a world of monsters, psychics, and magic. While her peers were conscripted for service in metaphysical law enforcement, Jemma was left behind-not human enough to fade into the background, not powerful enough for a place among supes.  Trafficked for illegal experimentation as a teenager, Jemma's only source of strength to survive abduction was the ghost of Niklaus Fox, a man who died thirty years before.
In a stroke of horrific injustice, he becomes her sole companion and confidant, long after her rescue. The stretch of years becomes unbearable as the love between them becomes a source of pain. She won't let him go, and she can't move on, even when he begs her to live the life he no longer has. Until the day her insignificant gift steals a woman back from death's embrace, and Jemma realizes her chance at happiness is not dead and gone.  Who will Jemma become to tear down the walls separating Niko from the land of the living?