Murder Most Unladylike: Murder Most Unladylike by Robin Stevens

Hazel Wong left something in the gym. Going back to retrieve it she finds something more gruesome: the corpse of Miss Bell the science mistress. She rushes for help only to come back and find the body gone. All but one other girl at Deepdean School for Girls believe the lie that Miss Bell resigned. Only Hazel’s best friend, the Honourable Daisy Wells, believes her. Together they set off on the hunt for truth. They face dangers and sensible adults trying to protect them and carry on as normal. However they get there in the end and uncover the criminal with Hazel getting a pat on the back and a promotion in her and Wells’ private detective society.