The seventh novel from the MacMillan Prize for Picture Book Illustration's winner Kate Pankhurst. The perfect book for 7-9 yr olds who love funny stories with quirky illustrations like DIARY OF A WIMPY KID, the DORK DIARIES and CLARICE BEAN.Mariella Mystery (That's me!) - totally amazing girl detective, aged 9 and a bit. Able to solve the most mysterious mysteries and perplexing problems, even before breakfast.After much a loved dinner lady, Diana Dumpling, vanishes from the school kitchens, Mariella and the Mystery Girls set out to investigate. They must find Diana and save their school dinners - but will they able to get to the bottom of this bizarre disappearance?