Jamie Bartlett tells the unbelievable story of the rise, disappearance and fall of Dr Ruja Ignatova, setting out on a globe-crossing investigation into the criminal underworlds, corrupt governments and the super-rich. Along the way, he reveals a very modern tale of intrigue, techno-hype and herd madness that allowed OneCoin to become a million person pyramid scheme - where, at the top, investors were making millions and, at the bottom, people were putting their livelihoods at risk. It's the inside story of the smartest and biggest scam of the 21st Century - and the genius behind it, who is still on the run.