Mariella Mystery is back, and in this seventh installment of the bestselling series, she's on a quest to save…LUNCH! No mysterious mystery or perplexing problem is too hot to handle for this super sleuth-y youngster and her gal pals. Mariella writes down clues as she investigates, and the most telling observations and drawings line the pages of her journals. It's the perfect recipe for cracking cases, and that's good--because she'll need a heaping helping of them when beloved lunch lady, Diana Dumpling, suddenly vanishes from the school kitchens. Can Mariella and the Mystery Girls find Diana, save their school lunches--and get to the bottom of this kitchen nightmare?