Cat among the pigeons

Unpleasant things are going on in an exclusive school for girls - things like murder...Late one night, two teachers investigate a mysterious flashing light in the sports pavilion, while the rest of the school sleeps. There, among the lacrosse sticks, they stumble upon the body of the unpopular games mistress - shot through the heart from point blank range. The school is thrown into chaos when the 'cat' strikes again. Unfortunately, schoolgirl Julia Upjohn knows too much. In particular, she knows