Every Mountain Made Low by Alex White

Ghosts have always been cruel to Loxley Fiddleback, especially the spirit of her only friend, alive only hours before.
Loxley isn’t equipped to solve a murder: she lives near the bottom of a cutthroat, strip-mined metropolis known as “The Hole,” suffers from crippling anxiety and doesn’t cotton to strangers. Worse still, she’s haunted.