With Ruja the Crypto Queen nowhere to be found and on the FBI Top Ten Most Wanted list, theories about her location intensify. And what about the missing billions too?

As the sceptics ramp up the fight against OneCoin, the Crypto Queen avoids the spotlight, then disappears. Is she really on maternity leave or has she just fled?

The charismatic Ruja Ignatova introduces her OneCoin crypto currency to the world and reaps the rewards. But some journalists and Bitcoin enthusiasts are unconvinced.