The Bromeliad Trilogy3 books in series
Truckers Publisher's Summary
To the thousands of tiny nomes who live under the floorboards of a large department store, there is no outside. Things like day and night, sun and rain are just daft old legends.
Then a devastating piece of news shatters their existence: the Store, their whole world, is to be demolished. It's up to Masklin, one of the last nomes to come into the Store, to mastermind an unbelievable escape plan that will take all the nomes into the dangers of the great Outside.
This is the first book in the Bromeliad Trilogy.