When a lobsterman discovers a sunken ship, Cranberry Island is abuzz with excitement. Is the wreck the remains of the Myra Barton , the missing ship of island sea captain Jonah Selfridge? Or the elusive Black Marguerite , which belonged to one of the most notorious pirates of the 17th century and vanished without a trace--except for the ghost ship that old-timers say roams the water on fog-shrouded nights? Soon the island is swarming with marine archaeologists...