One day in August 1995 a man called Foutanga Babani Sissoko walked into the head office of the Dubai Islamic Bank and asked for a loan to buy a car. The manager agreed, and Sissoko invited him home for dinner. It was the prelude, writes the BBC's Brigitte Scheffer, to one of the most audacious confidence tricks of all time.
Over dinner, Sissoko made a startling claim. He told the bank manager, Mohammed Ayoub, that he had magic powers. With these powers, he could take a sum of money and double it. He invited his Emirati friend to come again, and to bring some cash.
Black magic is condemned by Islam as blasphemous. Even so, there's still a widespread belief in it, and Ayoub was taken in by the colourful and mysterious businessman from a remote village in Mali.