The Treasure of the Black SwanA Junior Library Guild Gold Standard Selection May 2007. When an American treasure hunting company uncovers a shipwreck containing the greatest underwater trove ever found, the world is captivated by their discovery. But over in Spain, a group of low level government officials surmises that the sunken ship is in fact an ancient Spanish vessel. Thus begins a legal and political thriller, pitting a group of idealistic diplomats against a rich and