Mummy and daddy thought that Karlsson was one of those imaginary playmates that children think up when they are lonely. So they bought Smidge a dog. Of course, Smidge loved his Bumble, but Karlsson is a much better playmate. “It has to be fun, otherwise I won’t come!” says Karlsson as he comes flying in through Smidge’s window – bright and cheery and always ready with more cunning tricks.
In 2021, the books have been newly illustrated by Mini Grey and published by Oxford University Press in the UK. Previous editions were illustrated by Tony Ross.