The Book of General Ignorance round differs, in particular during the Christmas specials. During the course of the "B" Series special, Fry and Davies swapped places for "General Ignorance", with Fry attempting to answer questions ostensibly written by Davies to stump him. During "D"s Christmas Special, all the "GI" questions revolved around saints. "The Book of General Ignorance" contains a list of 230 questions, most of which previously appeared in episodes of "QI". Each question explains the correct answer, and usually attempts to show why people tend to make the wrong assumptions, or believe certain myths. Each book contains two forewords, one by Fry, the
Agatha Christie: And Then There Were None Adventure Company chose the novel "And Then There Were None" as the first game, instead of other Christie novels involving famous detectives Hercule Poirot and Miss Marple, for several reasons. Among them was the popularity of the novel, which would help with marketing; and the island nature of the story which would provide a natural barrier, while allowing more freedom of movement for the players within that confined area. One major obstacle in the development of "And Then There Were None" was gaining the approval of aspects of the game from Chorion, the company which owns the rights to Agatha