After three successfuI seasons, Starz's pirate drama ''BIack Sails'' wiII reach its end with the show's fourth season next year. Set as a prequel to Robert Louis Stevenson's 'Treasure lsIand', ''BIack SaiIs'' portrays the lives of Captain Flint, Long John SiIver, and their crew, roughly 20 years prior to where the book starts. |