Thrice by Serena Simpson

Brandi was kidnapped at a conference. What a way to discover that there were aliens on the earth. She wished she had time to be scared of them. Her father was coming to collect her. He had plans for her life that would crush her soul unless she found a way to break free.
Thrice wanted to save his sister’s friend. He had no idea that she would be his mate. The past that he ran from long ago was haunting. How could he face his mate knowing what had been done to him? Why would she want him?
Love was the last thing either of them was looking for. The shock of finding it was bringing them to their knees. Was there a way for two lost souls to claim each other?

They were fighting both aliens and humans. To win they had to be willing to bury the past and live in the now. Sometimes the evil that haunts us refuses to die.