The Pale Horse by Agatha Christie is a chilling standalone mystery where Mark Easterbrook, a writer, becomes embroiled in a perplexing case involving a dying woman's confession and a list of names found in her shoe. He uncovers a sinister organization called 'The Pale Horse,' rumored to use black magic to arrange deaths. As more victims seemingly die from natural causes, Mark must decipher whether he is dealing with the supernatural or a very human, and deadly, conspiracy. Christie masterfully weaves a tale of deception, fear, and the blurred lines between coincidence and carefully planned murder, challenging perceptions of justice and reality.