In 2009 Dr Ruja and her father bought a metallurgic factory in Southern Germany. What does this have to do with her disappearance today?

Those who knew her at the time tell a strangely familiar story about the impressive businesswoman who came to save their workplace.

The Missing Cryptoqueen is an eight-part series for BBC Sounds.

Presenter: Jamie Bartlett
Producer: Georgia Catt
Editor: Philip Sellars
Original music and sound design: Phil Channell
Original Music and vocals: Dessislava Stefanova and the London Bulgarian Choir

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