The Earl Returns (Lords of Sussex #1)
Lillian Marek

After three years as an involuntary seaman in the Royal Navy, the Earl of Merton returns to an England roiled by unrest. The end of the war has brought economic hardship and unemployment. Merton starts a shipyard, bringing employment to his neighbors but embarrassment to his family. They want him to marry suitably and settle down to a normal aristocratic life. He is not interested...until he meets Miranda Rokeby.
Miranda is the daughter of a Boston shipowner visiting her English relatives. She has an American disdain for useless aristocrats...until she meets Merton.
Together, they may be able to overcome the opposition of their families, but they have another problem.
Someone is trying to kill the Earl of Merton.