Cat among pigeons

Agatha Christie's detective audiobook The Cat Among the Pigeons

"Oh no!" Mrs. Upjohn exclaimed, still looking out of the window-"How strange!"

Meadowbank was one of the most successful girls' schools in England. The headmistress - Miss Bulstrode - commanded with a firm hand, but her heart was open to all. The place was her life's work and she loved it. The high tuition fees allowed the school to employ quality staff, and as a result, the parents of the students got exactly what they expected from the school. That is, until the murder of an unpopular PE teacher who was shot dead at the beginning of the summer term. After another attack, again in the middle of the night in the new sports pavilion, the school is in chaos. What does student Julia Upjohn know? She herself fears that it is too much.

He can't do without Hercule Poirot's help, at least not if he doesn't want to be the next victim...