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These letters consist primarily of correspondence exchanged between Madeleine Edison Sloane and her husband, John Eyre Sloane. Other correspondents include Mina Miller Edison, Charles Edison, Gen. Michael J. Lenahan, and W. E. Hitchcock of the London office of Guaranty Trust Co. Most of the letters were written by Madeleine during April-September 1918, following her return to Glenmont to await the birth of her second son, John Edison (Jack) Sloane. With the exception of a brief visit to New Jersey in early July, her husband remained in Washington, working in the office of the Chief of Staff in the Purchase & Supply Branch of the U.S. Signal Corps. The letters contain numerous references to World War I, which continued until the signing of the armistice on November 11, 1918. Included are comments about Liberty Loan campaigns, Red Cross drives, food conservation calls, civilian relief efforts, and the convalescent hospital for soldiers that Mrs. Annie Jenkins set up in her Llewellyn Park home. There are remarks about wartime women's organizations such as the "motor girls" of the Red Cross Motor Service and the "farmerettes" of the Woman's Land Army of America. Madeleine's own feelings about the role of women in the war are summarized by her remark that she "wouldn't be associated with these idiot women in their so-called war work for any thing under the sun."

Other war-related topics include Thomas Edison's discomfort around the many officers who were guests at Glenmont during the war; the attitude of Edison and his daughter toward opponents of the war; Madeleine's efforts to explain the concept of war to her two-year-old son, Teddy, and to convince her husband that there were valid reasons why her brothers Charles and Theodore had not enlisted; the deaths of acquaintances Vernon Booth, Mortimer Crane, and Michael McKay; the enlistment of Madeleine's half-brother William L. Edison in the U.S. Tank Corp. and his deployment to France; her attraction to Lt. Emil Breitfeld, a Jewish musician stationed in West Orange; the visit of the Blue Devils (an elite French army unit) to Glenmont in June; the impact of wartime labor shortages on the service staff at Glenmont; labor unrest at the Edison factories; and anticipated coal shortages during the winter of 1918-1919. Also included are references to an investigation by Charles Evan Hughes of possible impropriety in the awarding of aircraft contracts by the Signal Corps and a congressional investigation of the business dealings of Harry B. Mingle, who had purchased the Sloane Aeroplane Co. with Japanese backing in 1916.

In addition, there are nine letters that were written by Mina Edison during her stay at the U.S. Naval Station in Key West and the family's winter home in Fort Myers in February-April. Included are her impressions of the towns of Key West and Fort Myers, along with comments about the experimental work of Thomas and Theodore. Also included are remarks about the arrival at Fort Myers of Charles Edison and his friend Carolyn Hawkins and their spur-of-the-moment decision to get married before returning North. Letters by Mina and by Charles contain lengthy descriptions of the hastily arranged wedding and the reaction of Thomas and Mina to the surprise decision. Numerous comments about Carolyn, mostly of a negative character, appear in subsequent letters by Mina and Madeleine. Both women regarded her as somewhat frivolous and a bad influence on Charles, and Madeleine compared her unfavorably to Edith Hotchkiss, the new wife of her cousin Robert A. Miller, Jr. Mina was also concerned by the age disparity between Charles and the much older Carolyn.

Other topics include the death of former New York City Mayor John Purroy Mitchel, a cousin of John's half-brother Thomas O'Conor Sloane, Jr.; the death of Phoebe Canfield Meadowcroft, the wife of Edison's personal assis