Contains letters to and from family members and friends of Carson McCullers, most notably Tennessee Williams. Other prominent correspondents in the series include McCullers's cousins, Jordan Massee, Jr. and Paul Bigelow; Edith Sitwell, and Kathleen Batteen. There are also several letters from Carson's mother, Marguerite Smith, as well as Edward Albee, Bessie Brewer, Marielle Bancou, Julie Harris, Mary Mercer, Glenway Wescott, Robert Whitehead, and Donald Windham.
The largest component of the series is the typewritten manuscript of The Member of the Wedding, with the author's hand-written corrections. There are numerous variants for certain portions of the novel and material not used in the published version. The series also contains a copy of the manuscript of The Clock without Hands, which was sent at the request of McCullers to Jordan Massee by Robert Lantz of Robin Productions. Other material includes Jordan Massee's notes about The Member of the Wedding, as well as published and unpublished short pieces written by McCullers. Among these are an essay by McCullers entitled "Russian Realists and Southern Writers"; her contemplation on the writing process; a collection of verses for children originally bound in a notebook, Sweet as a Pickle and Clean as a Pig; handwritten lyrics for a song from The Ballad of the Sad Cafe; and finally, typescripts of "The Dual Angel" and "A Tree. A Rock. A Cloud," inscribed and signed by the author. At the end of the series, there are also two poems by Edith Sitwell, accompanied by Jordan Massee's notes.