Agatha Christie: Murder on the Orient Express stay as faithful to Christie's work and time era as possible. A major difference between "And Then There Were None" and "Murder on the Orient Express" that Sheldon pointed out was that in the former, the premise of the novel was that no one solved the murder. This forced Sheldon to desperately try to find a way to integrate clues into the story so that the player could actually discover the murderer, although the game remained quite uninteractive. In "Murder on the Orient Express", the actual novel follows an investigation, so Sheldon could more easily integrate clues to lead to
The Murder at the Vicarage does not participate in the investigation since his presence as the narrator was unnecessary in a filmed version. "The Murder at the Vicarage" was released by HarperCollins as a graphic novel adaptation on 20 May 2008, adapted and illustrated by "Norma" (Norbert Morandière) (). This was translated from the edition first published in France by in 2005 under the title of "L'Affaire Protheroe". The novel was first serialised in the US in the "Chicago Tribune" in fifty-five instalments from Monday, 18 August to Monday, 20 October 1930. The dedication of the book reads: "To Rosalind" The subject of this dedication