Pulitzer Prize-winning investigative journalist James Ball takes us into the depths of the internet to trace the origins and rapid ascent of QAnon, the movement that mutated from a niche online conspiracy theory into the world's first digital pandemic.

Imagine a deadly pathogen that, once created, could infect any person in any part of the globe within seconds. No need to wait for travellers, trains, or air traffic to spread it, all you need is an internet connection. In this grippin...