The two-year investigation, in collaboration with international media platform openDemocracy, has involved more than 15 BBC journalists across three continents. They gathered archive video recordings, documents, and hundreds of hours of interviews to corroborate Rae’s testimony and uncover further harrowing stories. More than 25 eyewitnesses and alleged victims, from the UK, Nigeria, Ghana, US, South Africa and Germany, have provided accounts of what it was like inside Joshua’s compound, with the most recent experiences in 2019.