Dr. Frank Light, archaeologist, is vastly annoyed. He's settled into a plush life - cushy department-head job at a university, suave girlfriend, book in the works. Now he's been ordered into the sludgy, back-water marshes of Maryland to fend off hordes of mosquitoes, all because of an inconsequential find at a bridge construction site. Maggie, the outspoken state archaeologist working the dig, insists the shipwreck has historical significance. Pastor Allingham is even more vehement, insisting the decaying timbers hide a rumored, long-lost slave graveyard.