On The Wylde Side by Chasity Bowlin

In desperation, the last of the Wylde Wallflowers, Cordelia, resorts to a scandalous method to find herself a husband. A personal advertisement.
When she placed the ad, she never imagined that she would draw a man like Lord Theodore Houghton, the Earl of Malvern. She certainly hadn’t expected that she would be so drawn to him, that the series of letters they exchanged before meeting face to face would already have her half in love with him. Also, she had not imagined that a single kiss could send her hurtling into a world of temptation and desire.
As a third son, with no prospects, Theo had done the unforgivable and dabbled in trade. When a terrible accident saw the title fall into his hands, he knew that he needed to do his duty— find a wife and continue the family line. But society has shunned him for having the audacity to make his own fortune rather than just marry it. Personal ads are his only avenue for finding the right sort of bride. Determined to make the best of it, he answers one fateful advertisement that turns into so much more.
When he first sees Cordelia, duty is the furthest thing from his mind. She’s much more than a means to an end for him, and If he lets his guard slip at all, she could well be his everything.But as the couple announces their engagement, not everyone is pleased for them. One mishap is immediately followed by a series of unfortunate incidents and near misses with calamity until Theo can no longer ignore the reality—someone is trying to kill them… And nothing complicates love like the threat of murder.