Hired Bride by Noelle Adams

For years, Deanna's eccentric grandmother has been trying to marry her off to a rich man, and she's finally managed to do it. Deanna has spent her life trying to take care of those she loves, and a six-month marriage should be a simple enough way to keep their historic Savannah house from falling down around their heads. Sexy, obnoxious Mitchell Graves needs a wife to finalize a business deal, and he snaps up Deanna as the most expedient option. Because she's quiet, he thinks she'll be easy enough to manage as a wife. He couldn't be more wrong.