Stinking rich and just plain stinky, or, A diamond as big as his head - Philip Ardagh

You won't find Grubtown on any maps. The last time any map-makers were sent anywhere near the place they were found a week later wearing nothing but pages from a telephone directory, and calling for their mothers. It's certainly a town and certainly grubby -- except for the squeaky clean parts -- but everything else we know about the place comes from Beardy Ardagh, town resident and author of these tales.

Grubtown is full of oddballs -- from the singing Grumbly girls to a family of duck-haters, and an out-sized mayor who's knitting a new house -- but Manual Org is too repulsive even for them. Getting him to leave town is top priority, until the discovery of a humongous diamond changes everything...