Bigger and fatter than all the other microbes in the valley, Wilton
feels ostracised and out of place. But even more worryingly, their world
has become unhealthy and toxic with mass illness and flash storms.
Setting out to find out what is wrong, Wilton meets Algy, a tiny microbe
small enough to sit on his shoulder (and take refuge in his guts) who
accompanies Wilton on his quest. Taking a wrong turn in an effort to
escape some killer fungus, they inadvertently end up outside - and
discover (thanks to some helpful bacteria) that the world in which they
live is actually one giant organism called Janet.