2nd part of the Bromeliad [or Nome] trilogy, aimed at children and adults alike.

The Nome had had to escace the Store to survive when it was to be demolished. That has shaken the confidence and faith of some of them in Alfred Bros.

[Taken from goodreads.com]
Geert Daelemans

Now that Masklin and Torrit have left to explore the place where those big metal things take off into the air, Grimma has to fend for herself. That is, she has to take care of the Nomes that have taken shelter at the quarry. But they are not alone. A very insistent human being is trying to invade their place. Grimma has to be creative to keep that pesky big annoyances away, but is afraid that they ultimately will have to flee to The Cottage. Luckily Dorcas, the techno geek of the nomes, has a secret weapon at hand: a CAT.