It's 2019, Fridays for Future fills the streets, "the climate" fills the news. Young journalist Theresa is at a family party in the west of Germany. There she is confronted not only with her mother's alcoholism, but also with the sometimes outrageous conspiracies of her extended family. Back in her editorial office in Berlin, Theresa and her colleagues set off in search of the sources of the climate conspirators in Germany. They soon come across organised climate denialist institutes - right in the heart of Germany. In order to gain a better understanding of how climate deniers network, what drives them and what their plans are, the editorial team goes undercover at a conference. And what they find out there will only be the beginning of a major research trip. Based on research by CORRECTIV, HEARTLAND immerses the audience in the heart of organised climate denial. Seven 3rd year drama students slip into a variety of roles - from investigative journalist to conspiratorial aunt to powerful boss of the American fossil fuel lobby.