I-Land: At the Edge of Civilization — Roothee Gabay

Near the modern islands of Sanibel, Useppa, and Boca Grande, a newly widowed and injured Gracie is stranded on a primitive island where she encounters the remnants of the ancient Calusa, who have hidden in the Everglades for over four hundred years. In their midst, not only does Gracie find love but a new way of life, and safety from cataclysm.