Vanquished by Sophie Stern

Ezra Fox has lived on Sapphira his entire life. He’s cold and heartless, but that’s the way he likes it. As a hunter, he has to be precise in everything he does. If he’s not, his prey will get away. He learned long ago he couldn’t trust anyone but himself, and that’s how he lives his life.
Dagger is being hunted. She runs as fast as she can, and as far as she can, and finds herself on the hidden planet of Sapphira where she promptly gets lost. The man who finds her is big, blue, and a complete badass.
Dagger finds herself falling for Ezra, but what will she do when her past finally catches up to her?