Paul Atreides is one of the most compelling characters in fiction, and the setup for the upcoming Dune: Part Threehas already revealed the character's greatest fear, which will dictate many of his actions in the new film. Following the incredible success of Dune: Part Two, the upcoming Denis Villeneuve sequel plans to pull from Dune Messiah, a novel written largely as a coda to the first book. To drive home Frank Herbert's dark themes about the corruption of power, Messiah features many complex story elements that will be difficult to adapt.