This is a great mystery story about friendship and team work. Set in the 1930’s in Deepdale Boarding School, Hazel and her best friend Daisy are trying to solve the disappearance and murder and of their science teacher Mrs Bell. As they try to find the person responsible, before they strike again, they themselves become targeted and chased. Their friendships is put to the test. This is a perfect book for fans of Enid Blyton mysteries and school based stories.