Loyalty's Price (Sisters of the Revolution #7)
Diana Davis

Mercy Hayes never intended to return to Philadelphia while the redcoats occupy her home—until her cousin needs her. Mercy holds her nose—literally and figuratively—to come back to the city to help, trying to forget her last moments in the city and an encounter with a certain handsome enemy captain.
Captain Lawrence Rogers knows that His Majesty’s Army cannot win the war unless they can sway the hearts and minds of Americans. But when Mercy Hayes joins him in Lord David Beaufort’s household, there’s only one heart Lawrence only cares to win.
Lawrence and Mercy find themselves drawn to one another even while their loyalties threaten to tear them apart. Can these star-cross'd lovers find a way forward together, or will the war come between them forever?