Verity forbids this fact, but Miss Griffin then provides her with evidence of her birth and the adoption, too. Miss Griffin had become an unmarried mother, which at the time was not considered normal and would have affected her chances of becoming headmistress. The diary serves as evidence that Miss Griffin, the headmistress has spoken to her a few weeks ago and informed her that she was Verity's true mother and that Mr. Towards the end of the book, Hazel and Daisy come across an old notebook, which turns out to be the diary of another character Verity Abraham, the girl who was rumored in the story to have committed suicide by jumping off the Gym balcony the term before Hazel arrived. They work tirelessly to piece the clues together and solve the mystery. A note was beside her corpse, stating that the murderer was sorry, but she knew she had to do it. Following this, Miss Tennyson has also died.

Then, the next day at Prayers, the other students also notice the absence of their science mistress, but they are satisfied when the headteacher informed them that she has received a resignation letter from Miss Bell. Thus, none of the characters believes that Hazel saw Miss Bell's dead body and believes that she was telling lies. Near the beginning of the book, Hazel stumbles upon the corpse of their Science teacher, Miss Bell, in the gymnasium, seemingly fallen from the balcony.but when Hazel returns with Daisy and one of the prefects, the body is gone. Daisy is the president of the detective society and Hazel is its secretary and vice president. They are the founding members of their school's Detective Society and its only members. The two principal characters, Hazel Wong and Daisy Wells are students in Deepdean School for Girls. In the US, the book was published under the name Murder is Bad Manners. The book has been nominated for several awards, including the Carnegie Medal. The story is written in the style of a casebook and follows two fictional boarding schoolgirl detectives, Daisy Wells and Hazel Wong, as they try to find the murderer of their science teacher.

It follows two schoolgirls in 1930s England solving their first murder mystery and is the first book in the 'Murder Most Unladylike' series.

Murder Most Unladylike is a 2014 children's mystery novel by British-American author Robin Stevens.

First Class Murder by Robin Stevens