A Cupcake Conundrum (Mariella Mystery Investigates)

Mariella Mystery - totally amazing girl detective, aged 9 and a bit. Able to solve the most mysterious mysteries and perplexing problems, even before breakfast. Someone is trying to sabotage the Great Puddleford Bake-Off, 'Bake or Break'. It's up to Mariella and her Mystery Girls to work out who, to save the Victoria sponges and pavlovas and prevent the entire contest from turning into a veritable cupcake catastrophe and kitchen nightmare.