LIBBY GEORGE and PAUL CARSTEN AT 7 a.m. on a recent Saturday, Onomene Adene received a call from a man whose voice she did not recognise. The man said he knew her from church and asked for help getting a package to their pastor. She agreed to meet him at a bank near her home in the Nigerian city of Lagos. But shortly after she arrived, according to Adene, three trucks pulled up filled with police armed with rifles and tear gas demanding that she take them to her brother. Terrified, she complied. "It was like they were coming for…