The Cat Among the Pigeons. Agatha Christie

In an elite school for girls, the unexpected happens in the middle of the night - a physical education teacher is murdered. She was disliked, but who would dare to shoot her at close range? And most importantly - why?
A police inspector takes up the investigation and makes a shocking discovery: a British intelligence agent has been among the school's employees. His mission is to find jewels that disappeared without a trace during the revolution in the eastern kingdom.
Meanwhile, panic begins at the school. One of the students is audaciously kidnapped. The only chance to unravel this tangle of intrigue is to turn to Hercule Poirot. But even for an experienced detective, this spy game can become dangerous...