A BBC Africa Eye investigation has found evidence of widespread abuse and torture by the late TB Joshua, founder of the Synagogue Church of All Nations in Lagos, which has followers around the world. The team was supported by Nigerian investigative journalist Adejuwon Soyinka, who tells us when the pastor first came to his attention and what he discovered about him. Secret trains and Russian prisoners The disappearance of imprisoned Kremlin critic Alexei Navalny, and his reappearance three weeks later in the so-called 'Polar Wolf' Arctic penal colony, has shed light on Russia's long history of secret trains and penal colonies, as BBC Russian's Oleg Boldyrev reports. Election protests in Serbia: the bigger picture Serbia has seen weeks of protests after alleged voting irregularities during parliamentary and local elections last month, won by the ruling party. President Aleksandar Vučić has rejected calls for an international probe, but the opposition coalition Serbians Against Violence continues to dispute the results, as BBC Serbian's Aleksandar Miladinović explains. Sindh's sibling rappers Two siblings from Sindh in Pakistan have been using rap to tackle taboo topics rarely discussed in their communities, including menstruation, domestic violence and religion. Shumaila Khan of BBC Urdu met them. Presented by Irena Taranyuk. (Photo: Nigerian pastor TB Joshua. Credit: Pius Utomi Ekpei/AFP via Getty Images)