After you read "The Murder of Roger Ackroyd", I recommend "Who Killed Roger Ackroyd?" by Pierre Bayard. (spoiler alert: Please don't Google this book until you

After you read "The Murder of Roger Ackroyd", I recommend "Who Killed Roger Ackroyd?" by Pierre Bayard. (spoiler alert: Please don't Google this book until you have read the Christie.) Bayard writes "revisionist readings" of popular mysteries, in which he exonerates the killers. He mixes in a fair amount of literary criticism. I have a hard time deciding how serious he is.