Qui a tué Roger Ackroyd?

the long version

"Agatha Christie's classic novel The Murder of Roger Ackroyd has sparked great debate in the years since its publication in 1926, inspiring cultural critics from Umberto Eco to Roland Barthes to explore its unique construction: a murder mystery in which the murderer appears to be the narrator. With Who Killed Roger Ackroyd?, Pierre Bayard reopens the Ackroyd file. This psychoanalyst-cum-professor of literature examines the details of the case anew and offers an ingenious rereading of one of the most popular mysteries of all time. Wondering why Hercule Poirot's conclusion about the identity of the murderer has never been questioned, Bayard uses a creative mix of literary theory and psychoanalysis to propose a startling new solution."--BOOK JACKET.