The Promise by Bethany-Kris

Roman Avdonin has always lived life on the edge of reason—hiding an unstable woman while officials knock down his family’s door and a mafia war brews really doesn’t seem that crazy, all things considered.

But everything about Karine Yazov is a beautiful, dangerous lie. And they’ve not even learned the worst of it.

All she knows is how to survive, and put into the hands of a man who seems like her wildest dreams, why would she fight? His stare lights her on fire, he gives her the safety she craves, and Karine can’t stop herself from falling …

Even if she knows the monster chasing her will never let her go.
Promises like his shouldn’t be broken, but secrets like hers could get them all killed.

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The Promise is book 2 in The Darkest Lies Trilogy. The Trilogy is standalone; the books should be read in order.