ISBN-13: 9781783447961 / Angielski / Miękka / 2019 / 64 str.
Eric is an ordinary boy who loves football, and hates tests. Then his Auntie Rose sends him a very strange present from her travels in South America: an ugly, stinky, stripy jumper with magical powers. Eric finds the jumper really does have a miraculous effect on his brain power - but can there be too much of a good thing?