The seventeenth laugh-out-loud, fully illustrated Tom Gates adventure! 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 and now Tom's annoyed his grumpy sister Delia. Can his best friend Derek help? Will Rooster the dog stop eating his homework?.