Sonya Juliet Esmée Florence Butt MBE (14 May 1924 – 21 December 2014), also known as Sonia d'Artois, code named Blanche, was an agent of the clandestine Special Operations Executive during the Second World War.

The role of courier was particularly important, as movements around a district were likely to encounter German check-points, and a male of military or working age attracted adverse attention; a woman on a bicycle, however, was less likely to be suspected, and if she attracted attention at all, it was usually the sort that makes a besotted sentry forget to check papers and luggage properly.

It did not advertise its vacancies and recruited by 'the usual methods': word of mouth, and other quiet and roundabout means; a skill in the appropriate language was a good starting point.

Sonya's colleagues in the SOE included Nancy Wake and Violette Szabo, as well as the French-Canadian army officer Captain Guy D'Artois, whom she would later marry.

On 28 May 1944, Butt was parachuted into the department of the Sarthe in the area of Le Mans with Francisque Eugene Bec and Pierre-Raimond Glaesner to work as a courier, under the codename "Blanche", for Christopher Hudson (codename Albin), the organizer of the Reseau (Circuit) Headmaster.

After one of the other agents (Francisque Eugene Bec) dropped with her was shot during a battle between the Maquis and the Germans on 16 June, Sonya took on the additional role of weapons instructor.

"[3] As a courier, her primary responsibilities were to carry money, pass messages and maintain contact with the SOE agents, Maquis and local operatives working with the circuit.

This was a very dangerous moment, but her cover story and false papers withstood the examination, and she was eventually released.

[4] In 1947, he received another very senior decoration, the George Medal (GM) for his work in rescuing an injured missionary in northern Canada.

After a tour in Japan, Guy served in the Korean War, before the couple settled down again in Canada.