Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can't wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don't just have an experiment to investigate, they have a mystery to solve!

When her first two attempts to help a monster with his embarassing problem go awry, Zoey and Sassafras will have to find a solution quick if Gorp is to make it to the annual monster ball.

A girl, Zoey, and her cat, Sassafras, use science experiments to help a dragon with a problem.