Papillon by Henri Charrière

Thanks to the Belgian consul, a man named Klausen, I was out of that foul hole twenty-eight days later. The black, whose name was Palacios, had been let out three weeks after my arrival and had the brilliant idea of asking his mother to tell Klausen that there was a Belgian in the dungeon. He had thought of this one Sunday when the consul was visiting a Belgian prisoner.

So one day I was taken to the chief warden's office. He said to me, "You're a Frenchman. Why are you appealing to the Belgian consul?"