‘Silo’ Season 3 interview: Showrunner Graham Yost on how Rebecca Ferguson turned Juliette into a reluctant revolutionary

As Apple TV’s ‘Silo’ finally excavates the origins of its underground civilisation with its third season, showrunner Graham Yost talks about Juliette’s inadvertent metamorphosis into a revolutionary, and how Hugh Howey’s dystopian fiction keeps returning to the elemental questions of freedom and truth