Her Hearts Tomb — Jennifer Kacey

When an international tomb raider finds herself trapped with the enemy, she unearths her most precious discovery in the only man she's ever loved.
The tomb raider, Sonya, needed nothing but the pack on her back and the next treasure drawing her forward. She certainly didn't need a man to help her. Absolutely not the one man she ever cared about. Jack.
Jack couldn't let his heart get involved with any woman. Especially not a raider after the same jobs as him. He certainly couldn't let his guard down around the one woman he wanted more than his next prize. Sonya.
Falling for each other was the last thing either of them wanted, until they're trapped in a tomb together with no place to go but into each other's arms.