In The King of Nantucket, the serene summer setting of Nantucket Island contrasts sharply with its turbulent history. As two visitors enjoy a picnic with their guide, Mr. Gardner Coffin, they delve into the island's past, learning about the oppressive rule of Tristram Coffin, the chief magistrate. The guide recounts how, despite its beauty, Nantucket was rife with civil strife and injustice, particularly during the late 17th century when the island was under the thumb of a tyrannical leader.