The Blood Between Dawn and Dusk

For nearly eight hundred years, Ruby has lived with one unanswered question.
Who turned her into a vampire?
Abandoned by her creator during the Middle Ages, Ruby has spent centuries collecting knowledge instead of power. Now posing as a history professor at a college in Marion, Ohio, she enjoys a quiet immortal life alongside her mischievous black-and-white cat Lily, her witch best friend Eleanor, and two prank-loving ghost twins haunting her apartment.
But when dozens of bodies begin appearing across Marion under suspicious circumstances, the ancient vampire government arrives with only one suspect.
Ruby.
Assigned to investigate is Cassian Vale-a legendary vampire enforcer with piercing blue eyes, a commanding voice, and enough arrogance to infuriate her.
He believes she's guilty.
She can't stop staring at him.
As they uncover a conspiracy buried beneath Marion's forgotten history, both discover that someone far older than either of them has begun hunting again.
Someone connected to Ruby's forgotten past.
Someone who has been watching her for centuries.
And if they fail to stop them, neither humans nor vampires will survive what awakens beneath Marion.