Flat Earth: The Ultimate Cover-Up" follows investigative journalist Mark Reynolds on a journey sparked by his discovery of online flat Earth communities. Intrigued by the fervent discussions and the questioning of established truths, Mark delves into this world. His exploration leads him to encounters with proponents of the flat Earth theory, as well as those who oppose it. Along the way, he grapples with themes of truth, belief, misinformation, and the power of narratives.