The Dark Frigate: A great adventure story of boys (and girls)

The Dark Frigate is a pirate adventure set in seagoing England. Its Shakespearean language might challenge young readers, and even mature readers should keep Merriam-Webster within reach of this book. The book's author, Charles Boadman Haws, a 1923 Newbery Medal winner, grew up a seaman and added detailed research and firsthand accounts to preserve the authenticity of his book's portrayal of 13th-century seafaring life. Its attention to detail and its rhythmic, expressive language create an adventurous tale of substance. However, the rich and complex moral layering provides no easy answers- good guys often do bad or wrong things, and bad guys also can be very good people; these factors pull The Dark Frigate up to the level of great literature.

Is this related to the substory in Alan Moore's Watchmen?