Watch Heart of Darkness Season HD Full Free on solarmovie.do. Watch Heart of Darkness tv series online free. Heart of Darkness (2019) is a television mystery series on Investigation Discovery that focuses on r...Heart of Darkness (2019) is a television mystery series on Investigation Discovery that focuses on relationships, friendships, and family bonds that have ultimately turned tragic. It features re-enactments of true crime stories, interviews with those involved or close to the case, and actual footage of events surrounding the story when applicable.