The Devil's Guardian

Not many individuals can say they found their parents and young sister brutally murdered one fall afternoon.
Little Neve Deveraux was unfortunate enough to say she did. Her family's killer left the nine-year-old girl a single blood written message after the satanic murders. He claimed he would one day return for her. The killer was soon caught, leaving Neve to disbelieve this terrifying threat.

Sixteen years later, the newly christened Neve Stone still lives a broken existence due to her family's premature passing. Living a brand new life as a small-town homicide detective she's determined to leave her grisly past behind her. Only, there's some unknown presence in her life who doesn't want her to forget where she came from...
This person wants her to remember exactly what happened the date of September 9th, 1999 for a reason.
It looks like her family's true killer has finally come back for her.

Amazing cover made by @RachelS8766