Kahn-Harris sets out not to unpick denialists' arguments, but to investigate what lies behind them. The conclusions he reaches are shocking and uncomfortable. In a world of `fake news' and `post-truth', are the denialists about to secure victory?

Denialism - applied to the holocaust, global warming, the spherical nature of the Earth and other evident truths - is considered here as recurrently the outward indication of a darker desire or more destructive agenda, and exposed as often surprisingly and frustratingly successful.