Tom's doing everything possible to stay out of trouble but somehow he's got three sad faces on the school achievement chart! And getting another sad face means Mr Fullerman won't let him go on the school trip! Moany Marcus Meldrew is making things worse. If that's not enough, Tom's grandparents, The Fossils, are getting married (again). His mum's gone all 1970s, his dad's got a new novelty car, and grumpy Delia is furious about something. Can his best friend Derek help? Will Rooster the dog stop eating his homework?