Eternal by Chloe Kent

Eternal: The conclusion
Who exactly is Farren Kinsley?
A doubtful omega. Two alpha kings who will stop at nothing to keep her. And a war that could tear them apart.
When Ashton Maximillian walked into her office and offered her an obscene amount of money to help rescue his brother, Duncan who was held captive in a castle belonging to vampires, Farren Kinsley had no idea that she was changing the course of her future forever.

Now after falling deeply in love with both twin alpha wolf kings, Farren’s happiness is riddled with a dire revelation about her mates, a riveting discovery about her past, and a devastating personal transformation that puts her mates lives’ at risk.