The collection consists of thirty-four typed, bound scripts used during the production of the plays at St. James's Theatre. Those having manuscript revisions, stage directions, and photographs of the production are noted in the following list of the plays.

The collection includes approximately forty letters written by Henry Arthur Jones to others involved in the theatre, such as actor-manager George Alexander (1 letter), dramatist William Leonard Courtney (5), playwright Harrison Grey Fiske (1), actress Elizabeth Robins (1), playwright Augustus Thomas (3), dramatic critic Arthur Bingham Walkley (1), critic and playwright Malcolm Watson (1), and dramatist Freeman Wills (1). Also found in the collection is the typescript of "Cock o' the Walk," a five-act play by Jones, the manuscript of an article by Jones on motion pictures and a biographical study of Henry Irving.

Much of the collection relates to Brandon's theatrical interests. Included in the two boxes of correspondence are letters, mostly social in nature, written between 1883 and 1947 by actors, playwrights, producers, and others involved in the theatre. Some of the more noteworthy correspondents include letters from Herbert Beerbohm Tree (18 letters), George Alexander (10), Arthur Wing Pinero (2), Ellen Terry (2), Clement William Scott (1), Henry Irving (1, signed by him but in Bram Stoker's hand), W.S. Gilbert (1), and Max Pemberton (6). Many of the letters are in regard to the Theatrical Trust, which Brandon administered. Five boxes contain manuscripts and typescripts of plays written, co-written or translated by Brandon. In addition to the theatrical documents, there are two boxes and five scrapbooks that contain material on Brandon's legal career and the cases that he and his firrm, Brandon and Nicholson, handled. Other items include financial and legal agreements, his marriage settlement to Sara Apfel (July 25, 1904) and several program of the many plays and operas he attended.