Eric is an ordinary boy who loves football, and hates tests. Unluckily,
a big test is coming up! Then his Auntie Rose sends him a very strange
present from her travels in South America: an ugly, stinky, stripy
jumper with magical powers. It can turn the wearer into a genius, so
long as it is never washed. Eric finds the jumper really does have a
miraculous effect on his brain power - but can there be too much of a
good thing?