Eternal — Chantelle Nay

Destry and Emma are destined souls, meant to be
together, but the Dark Ones are determined
to tear them apart. Something evil is lurking
in the shadows, and Emma must find a way to
defeat the demons who threaten to take away
the boy she loves or lose him forever.
But she can't do it alone.
The powers of Heaven take on the angels of Hell
in this last chapter of the Eternal series,
and there can only be one winner.