Midnight Rose by Patricia Hagan (Paperback), Harper Collins Publishers, 1991
Breathtaking Erin Sterling was a glistening blossom among the pale debutantes of Virginia's gentry. The headstrong stepdaughter of a despised slave trader, she vowed she'd belong to no man. Then she met Ryan Youngblood.
From the moment he spied the ebony-haired enchantress at the annual Rose Ball, Youngblood knew he had to possess her. But he never dreamed that his forbidden desire would flame into a dangerous and all-consuming need, and a marriage that would scandalize society.
In a story that sweeps from the rolling plantations of Richmond to the underground slave movement of Philadelphia, they would pursue their wild, breathless passion, and surrender at last to the promise of a bold and unexpected love.