Hercule Poirot has been invited to the exclusive Kingfisher Hill estate to help defend someone who has already confessed to murdering Frank Devonport. To get there, he must endure a journey by coach, which is interrupted by a woman who is convinced that another death is imminent. Later a body is discovered with a macabre note attached...
Could this new murder and the incident on the coach be clues to who really killed Frank Devonport? And can Poirot solve the mystery in time to save an innocent person from the gallows?