Endangered Species (1997)

Back cover:

Marooned on Cumberland Island National Seashore off the coast of Georgia, Anna Pigeon waits out a twenty-one-day assignment on fire detail. When the sudden crash of a drug-prevention plane calls her and the other members of the fire crew to action, the flames are quickly extinguished. But suspicions smoulder over the cause of the accident, which killed both the pilot and his passenger, Cumberland's law-enforcement ranger Todd Belfore.

As the humidity levels rise so too do the tensions on the island, and Anna and her crew find themselves pressed into service. Her inquiry causes her to stumble upon shady dealings that question the integrity -- and honour -- of her own crew, and leave her face-to-face with tht price that must be paid to protect the treasures of the island...