"Dirk Pitt rescues a beautiful undercover agent in a daring underwater operation at Orion Lake, just north of Seattle, he confronts a sinister network run by Qin Shang, a ruthless smuggler who sells Chinese immigrants into slavery. As he moves to probe Shang's mystifying seaport in the Louisiana bayous, his investigation involves him in an adrenaline-pumped race up the Mississippi River and a desperate dash to recover sunken Chinese treasures lost half a century before."--Publisher.