"The Murder of Roger Ackroyd" by Agatha Christie is a classic mystery novel that follows the investigation into the murder of a wealthy industrialist, Roger Ackroyd, in a small English village. The investigation is led by Hercule Poirot, a renowned detective who has retired to the village and becomes involved in the case at the request of a friend. As Poirot interrogates the suspects, including the victim's family members and associates, he uncovers a web of deceit and hidden motives, ultimately leading to a shocking twist ending that has become one of the most famous in detective fiction. The book is a masterful example of the "whodunit" genre, with clever plotting, a cast of memorable characters, and intricate clues that keep readers guessing until the very end. It is widely regarded as one of Christie's best works and a cornerstone of the mystery genre.