The Cornish Heiress (Royal Dynasty #2)
Roberta Gellis

Philip St. Eyre wanted to fight Napoleon. Raised as a Frenchman and able to pass as French, he was the perfect spy and had a way to reach France through his father's old friend, the smuggler Pierre. Thus Philip met Red Meg and fell in love.
Meg thought Philip was Pierre's by-blow, Philip thought Meg was a common smuggler. To both gently born lovers the match was impossible. Until Black Bart tried to murder Meg, and Philip had to take her to France where her handiness with a pistol saved his life and his mission and exposed all their secrets.
Publisher Note: The book was previously published elsewhere in 1981.