Considered to be one of Agatha Christie's most controversial mysteries, breaks the rules of traditional mystery. The peaceful English village of King’s Abbot is stunned. The widow Ferrars dies from an overdose of veronal. Not twenty-four hours later, Roger Ackroyd—the man she had planned to marry—is murdered. It is a baffling case involving blackmail and death, that taxes Hercule Poirot’s “grey cells” before he reaches one of the most startling conclusions of his career.