The Devil and the Heiress by Harper St. George

Sparks fly when a runaway heiress bargains with a devilish rogue to escape a marriage of convenience.
No one would guess that beneath Violet Crenshaw’s ladylike demeanor lies the heart of a rebel. American heiresses looking to secure English lords must be on their best behavior, but Violet has other plans. She intends to flee London and the marriage her parents have arranged to become a published author–if only the wickedly handsome earl who inspired her most outrageously sinful character didn’t insist on coming with her.
Christian Halston, Earl of Leigh, has a scheme of his own: escort the surprisingly spirited dollar princess north and use every delicious moment in close quarters to convince Violet to marry him. Christian needs an heiress to rebuild his Scottish estate but the more time he spends with Violet, the more he realizes what he really needs is her–by his side, near his heart, in his bed.
Though Christian’s burning glances offer unholy temptation, Violet has no intention of surrendering herself or her newfound freedom in a permanent deal with the devil. It’s going to take more than pretty words to prove this fortune hunter’s love is true….