'Who is to blame?'

One of the world's highest-earning Multi-Level-Marketers and former OneCoin top seller agrees to speak. In his mansion on the outskirts of Amsterdam, Jamie learns the secret behind OneCoin's rapid growth and the huge amounts of money that has been made by those at the top.

The Missing Cryptoqueen is an eight-part series for BBC Sounds, with new episodes every Thursday.

Presenter: Jamie BartlettProducer: Georgia CattEditor: Philip Sellars Original music and sound design: Phil ChannellOriginal music and vocals: Dessislava Stefanova and the London Bulgarian ChoirWritten and researched by Jamie Bartlett and Georgia Catt