When the pirate ship Whydah went down in a violent storm just off the coast of Massachusetts in 1717, she took a huge treasury of stolen gold and jewels with her. Pieces of eight have continued to wash ashore since that ill-fated voyage, luring treasure seekers and undersea salvage experts. Here is the story of this plunder, of the pirates who amassed this horde during one legendary year upon the Spanish Main, and the tragedy of their loss upon the...