a young London writer, Frixtone must come to Paris because of his publisher Histman who found him a subject of a new novel on Paris. He will discover through this the world of discretion, dangerous neighbors, multicultural neighborhoods, as well as his commentaries. One day during his Sunday walks along the Seine, he discovered a mysterious library held by ghosts of the past. They discuss about society, books fly, words come out of books etc. One day Frixtone will be sucked by a black hole from nowhere in the smallest street in Paris, the street chat-qui-pêche . He comes across a sans nom's secret society whose members answer on behalf of NS as north-south. The mysterious phrase is north-south ghost. They will entrust him with a mission through Paris. What will he discover, What risk is he running? Does his publisher understand him? What is this sentence?