Sophie is joined by psychotherapist and fellow Agatha Christie superfan Helen Acton to discuss grudges — valid/reasonable and invalid/unreasonable — in the novels of Agatha Christie, the Queen of Crime. Also in this episode: the beauty of three-layered puzzle solutions, the Insufficient Poirot Content grudge some fans have about novels like Cat Among the Pigeons and After the Funeral, and Sophie reveals her grudge-related theory about why Murder on the Orient Express and And Then There Were None are Agatha's two most popular and beloved books.