A beautiful redhead, Antoinette “Tony” Dubois, becomes a journalist at La Voix de Paris.
Tony has two passions: her cat Filippon and her saxophone which she uses to play jazz or blues.
With his teammate the photographer Alain Pichet, Tony begins to frequent high society and cover important events.
This is how she notices Madame Lapin, a rich woman at the head of a huge criminal cartel.
During their investigations, Tony and Alain will experience adventures in the four corners of Paris (at the Louvre, on the Eiffel Tower, at the Opéra Garnier), on the Normandy, aboard the Orient-Express, in Spain and even in America and meet many personalities of the time (Al Capone, Johnny Weissmuller, Coco Chanel, etc.).