John Boss loves the dream business he and his wife, Jackie, created once he left the military. His scuba-diving instruction facility in Crystal Springs, Florida, is perfect for his love-of-water lifestyle and he helps many students learn the facets of underwater adventure-both in open water and in the dark and murky caves of the Gulf Coast of Florida. His military past as a Ranger had taught him well, and his skills at cave diving made him one of the leading deep-water, dangerous dark-hole rescuers in the country. Few have been to the depths he's reached, but he's glad those military times are over ... but then the military comes calling ... again. Will guns and war forever be a part of his life? Facing the fact that he will again be torn between love of family and love of country, John stands on the edge of what he wants and what is right as he prepares to head to deep, dark, underwater caverns and danger ... again.