Ghostly pirates, lost treasure, and high adventure abound in Fathomless, the sequel to Spineless, set in glittering Gilded Age Florida.

After months away at boarding school, Lulu Davenport was looking forward to summer vacation at her home on the southwest Florida coast, especially since her best friend, Algie Emsworth, will be spending his vacation with the Davenport family. But since his widowed mother has fallen on hard times, he's gotten a job nearby that keeps him away from the house most of the day. And Frankie, Lulu's sister and usual companion, is out of commission after injuring herself while sailing. But when Lulu hears about a possible haunting in a nearby abandoned fort and rumors of hidden treasure, she decides it's time to strike out on her own and solve the mystery herself. In the process, she meets Vic, a blind boy who's just moved to town, and the two of them embark on a hunt for clues about the ghostly appearances. Soon enough, Frankie and Algie join them, and the four friends uncover all sorts of very real dastardly deeds going on, and the villain is much closer to home than they expected!

Fathomless is full of hijinks, mystery, and heart, as Samantha San Miguel brings readers into the wild and wonderful world of nineteenth century Florida in this sparkling sequel to Spineless.