 They discovered that Schulze-Boysen's cousin, Gisela von Pöllnitz was planning to visit the Exposition Internationale des Arts et Techniques dans la Vie Moderne that was being held in Paris between 25 May to 25 November 1937.After extensive discussion the group decided that she should deliver the letter to the Soviet Embassy in Paris.In due course, Von Pöllnitz fulfilled her mission and placed the letter in the mailbox of the Soviet Embassy on the Bois de Boulogne.