But the school year suddenly takes a deadly turn when one of the teachers is found shot to death. As the investigation ensues, it becomes clear that the killer was not an outsider--and equally clear that no one at Meadowbank is who he or she seems to be. It is up to Hercule Poirot to determine who is who--and, more importantly, what has drawn the killer to the school--before anyone else falls victim to the cat among the pigeons.