The first book of a hilarious series, with characters as endearing and unforgettable as caramels that stick to your back teeth.

In Catarina's 6th grade class, there are: Esther, the best friend she loves fighting with. Idrissa, the soft-hearted nerd. Ninon, who believes absolutely everything she's told. And Pablo, who is often mistaken for a girl but doesn't care. These five inseparable friends form... the Jellyfish Gang! They're all convinced that life starts in sixth grade. But when Catarina discovers a magic hat, the school year takes a crazy turn...