Marry me by sundown / Johanna Lindsey.

After a social whirlwind in London, Violet Mitchell is summoned back to Philadelphia only to discover her family living on the edge of financial ruin while their father seeks new wealth in Montana's gold fields. With the family's home and social standing at risk, Violet makes a drastic decision. Meanwhile, Montana rancher Morgan Callahan rode away from his family's cattle farm to make his own fortune. Now as he finishes exploiting a mother lode of silver, a young woman claiming to be his late partner's daughter turns up wanting to be taken to her father's mine. Suspecting that the pretty schemer works for the mining outfit that is trying to steal his land, he has no qualms about snatching her and holding her at his camp where she can do no harm. But he underestimated the new thorn in his side. Determined to claim what rightfully belongs to her family, Violet summons up the courage and grit to cope with the hazards and discomforts of an untamed land and the disturbingly masculine stranger who holds her fate in his hands. But an error of judgment brings down a hailstorm of danger that upends her plans and deepens her bond to a man who may turn out to be all she desires.