When the kids discover that Topher may be more dangerous than they could have imagined, addicted to the rocks that give him superhuman abilities, will they help him or will they turn their backs on their new friend?.
The story takes place in 1933 and sets the Belgian sleuth on the trail of a serial killer. The elusive murderer seemingly selects his victims and the locations of their deaths alphabetically, sending Poirot a series of taunting letters announcing his next move and leaving a railway guidebook at the crime scenes as a calling card. As he travels the length and breadth of the country, the detective finds his authority, his integrity and his very identity called into question.