Trolls and angry gnomes

Everybody knows the saying: It must have been the little people.
But is that really fair?
The gnomes are being sick of being blamed for everything. They want to expose the real culprits who make a mess of the house where Iris lives with her family. But for this, the gnomes will have to take the trouble of travelling all the way to Trollony.
An exciting story for children from age 6 to 10.