Question: is the series black sails based on a book

Answer: No, Black Sails is an American historical adventure television series set on New Providence Island and a prequel to Robert Louis Stevenson's novel Treasure Island. The series was created by Jonathan E. Steinberg and Robert Levine for Starz. It debuted online for free on YouTube and other various streaming platform and video on demand services on January 18, 2014. The debut on cable television followed a week later on January 25, 2014. Steinberg is executive producer, alongside Michael Bay, Brad Fuller and Andrew Form, while Michael Angeli, Doris Egan, and Levine are co-executive producers.