Welcome to a new term at the River School! Jummy and Caro are thrilled to be working with their Nile House friends on the school corn-planting competition. But as they try to grow the biggest crops, they realize the beautiful Shine-Shine River is running low – why, and what does it have to do with the sinister bakery nearby? The friends will have to step up if they want to save the river and its wildlife – and win the school prize in the process…