His Dirty Girl by Faye Byrd

Two years later, and this pair is as dirty as ever.
Randi has finished school and is on the hunt for a full-time nursing position, but first they travel to Redding where Enzo has business to tend. Things go horribly wrong when an attempt is made on Randi’s life.
Enzo loses his shit.
And Randi demands he teach her self-defense.
It isn’t until they’ve returned to Crescent City when the real danger rears its ugly head. Joshua, a kid Enzo has taken under his wing, goes missing after attempting the unthinkable. Puzzle pieces fall into place and cold hard reality slaps Enzo across his face.
A ghost from the past isn’t really a ghost.
Can Ezno save the kids?
Or will Jackson Landers have the last laugh?