Cat Among the Pigeons by Agatha Christie

At an exclusive girls’ school, a series of unsettling events begins when a teacher is murdered, followed by the disappearance of a priceless jewel. What appears to be an ordinary school environment hides international intrigue involving revolution, espionage, and political secrets. Hercule Poirot steps in to protect the students and uncover the truth behind a deadly conspiracy that reaches far beyond the classroom walls.