Antoinette "Tony" Dubois is a red-haired journalist with green eyes, employed by the Parisian newspaper *La Voix de Paris*. She moves to Paris to build her journalism career. Tony's vibrant red hair is often styled to complement her fashionable attire. Her work focuses on investigating criminal activities, specifically targeting the operations of Madame Lapin (also known as Madame Ralin), the leader of a major criminal syndicate.

Tony's investigations take her across Paris, from the Louvre and the Eiffel Tower to the Opéra Garnier. When her assignments extend beyond France, she travels aboard the Normandie, the Orient-Express, to Spain, and to America. During these journeys, she encounters historical figures like Al Capone, Johnny Weissmuller, and Coco Chanel.

Beyond her work, Tony has two key passions: playing jazz and blues on her saxophone, and her cat, Filippon. The cat sometimes gets separated from her during cases, leading to comedic situations where it interacts with others. Her professional partner is photographer Alain Pichet; they collaborate closely, whether navigating high society events or confronting dangerous situations together.

Tony is defined by her fierce determination to uncover the truth, frequently placing herself in peril. She wears various costumes throughout her adventures, including tight or low-cut designs that emphasize her figure. Her persistence in pursuing leads and challenging authority underscores her commitment to journalism. Her background prior to moving to Paris is not detailed, and significant personal evolution across the series is not documented.

Her relentless pursuit of leads results in unexpected encounters and global travel with Alain, cementing her role as an intrepid reporter dedicated to exposing crime.