 The diaries feature a great deal of background information, far more than could reasonably be put into the novels.However, some of this occasionally finds its way into the series proper - the concept of female assassins, the introduction of Black Widow House, and the characters of Miss Alice Band and Mme les Deux-Épées were notable ideas that first appeared in the Assassins' Guild Yearbook, and later in the Discworld short story "Minutes of the Meeting to Form the Proposed Ankh-Morpork Federation of Scouts" in "A Blink of the Screen", to then becoming characters and a playable Assassins' Guild House in Discworld MUD.The early diaries are illustrated by Paul Kidby.