I first read Joe Doe's sequel to Denise's original on C.Lakewood's site a while ago and I've been fascinated by the "mistaken octoroon" genre ever since. There are very few stories touching on the topic I've located online over the years and this is probably still one of the best.
Susana Dupree lived a life of luxury and privilege...and she was bored. She had always belonged to the Jamaican planter class, and now, in 1730, her life was settled into such a deep groove that she often thought she was inextricably trapped.
In the early days, she had been occasionally diverted by interesting news from Europe -- but the War of the Spanish Succession had ended half her lifetime ago, and there hadn't been anything of similar importance since. Local pirate raids and outbreaks of pestilence had their moments, but there had been none near enough or remarkable enough for a long time. In her early teens, she had been intrigued, briefly, when she'd come across her grandmother's journal and its allusions to some mysterious "Family Secret," which apparently involved Susana's French great grandmother. But Susana's mother denied knowing anything about it, and, shortly thereafter, the journal vanished.
(The family motto was not "Out of sight, out of mind," but it might as well have been.)
When she was 16, she had married Jack Dupree over the objections of her parents. He was less wealthy than her family, but was such a devilishly attractive rakehell, and his very character defects made him particularly exciting.
But it was not long before the boredom returned. Jack was always gone some place or another. She was lonely. There were a few opportunities to socialize, but she was always alone. After all, a married man could have any number of affairs and still remain a "gentleman," but a lady was not so free. The wild abandonment of her early relationship with Jack was soon enough replaced by his indifference. She longed in vain for their lost passion. No matter what she did to rekindle his interest failed miserably.