Sometime Garrett collaborator Michael Kurland (who would himself write later Lord Darcy works, with the permission of Garrett's estate) appears as Sergeant-at-Arms Michael Coeur-Terre in "Too Many Magicians"; and in "A Case of Identity" the Marquise of Rouen, worried about her missing husband, is described as drinking herself into a stupor on "the best brandy, the St. Courlande-Michele." Similarly several books feature a magical theorist named Sir Thomas Leseaux, a play on another of Garrett's friends, the author and stage magician T. A. Waters; indeed, during the events of "The Unicorn Girl" Lesaux and Waters come face-to-face.