Mercer Mann, a popular writer from Camino Island, is back on the beach, marrying her boyfriend, Thomas, in a seaside ceremony. Bruce Cable, infamous owner of Bay Books, performs the wedding. Afterward, Bruce tells Mercer that he has stumbled upon an incredible story. Mercer desperately needs an idea for her next novel, and Bruce now has one.

The true story is about Dark Isle, a sliver of a barrier island not far off the North Florida coast. It was settled by freed slaves three hundred years ago, and their descendants lived there until 1955, when the last one was forced to leave. That last descendant is Lovely Jackson, elderly now, who loves her birthplace and its remarkable history.

But now Tidal Breeze, a huge, ruthless corporate developer, wants to build a resort and casino on the island, which Lovely knows, deep down, is rightfully hers.