Guillermo Galdos follows Brazilian federal police cracking down on illegal mining in protected Indigenous regions and the network of companies dealing in the precious metal. Officially Brazil exports a hundred tons of gold a year. But efforts by police, academics and non-governmental organisations reveal evidence that possibly almost half of Brazil's gold trade comes from an illegal source, raising serious concerns for tech companies using gold in their products.

Symeon Brown investigates how one influential preacher in Kenya could have led hundreds of men, women and children to their deaths. So far 429 bodies have been exhumed from graves in Shakahola Forest, where Pastor Paul Mackenzie is accused of inviting his followers to meet Jesus and witness the 'end of days'. Mackenzie denies any wrongdoing, but Symeon tracks down the survivors and the families searching for loved ones to find out if this was mass suicide - or mass murder.