This unedited and uncorrected typescript of the diary and papers of Sean Lester covers, in part, the period when he was League of Nations High Commissioner in Danzig (1935-1937), Deputy Secretary-General (1937-1940) and Secretary-General (1940-1947, by decision of the General Assembly in 1946) of the League of Nations in Geneva.

The material bound in this "Diary" is by no means complete, even for the 1935-1941 period. Some time after the "Diary" was bound, a further box of papers, covering most of S. Lester's life, was found, including: private diary entries, general S. Lester's notes, correspondence, press, etc. In fact, some of the most important papers for 1935-1941 were found and are not therefore in the "Diary" - for instance as regards the 1936 crisis.