Synthesized answer
The central thesis of Pierre Bayard's text is that Agatha Christie's solution to the murder of Roger Ackroyd is flawed [Passage 1]. Bayard, a psychoanalyst and literary scholar, offers a re-reading of the classic novel, challenging Hercule Poirot's conclusions about the killer's identity [Passage 1].
Bayard contends that Poirot's solution is both "motiveless as it is impractical" [Passage 1]. He presents a new solution to the crime, implying that the established narrative and its resolution are inadequate [Passage 1]. The passages do not elaborate on the specific details of Bayard's proposed new solution or the exact nature of the flaws he identifies in Poirot's reasoning beyond the general statements provided.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Who Killed Roger Ackroyd? by Pierre Bayard Description: A psychoanalyst and literary scholar offers a re-reading of Agatha Christie's classic novel, "The Murder of Roger Ackroyd," challenging Hercule Poirot's conclusions about the identity of the killer and presenting a new solution to the crime. Categories: Fiction Pages: 182 Snippet: In her most famous work, the murder of Roger Ackroyd, Agatha Christie confounded the conventions of the detective story by exposing her narrator as the killer. But Hercule Poirot's solution to the crime is a motiveless as it is impractical.