Terry Pratchett's lovable nomes return in "Diggers," the second book of the Bromeliad trilogy. It's an improvement on the first book "Truckers," with a steadier pace and a new twist on this tiny-aliens-among-us plotline. It gets a bit silly at times, but doesn't wear out its welcome.
When last seen, the peculiar, lovable nomes had managed to drive a truck away from the Arnold Bros. store, and had set up a new home in an abandoned quarry. Masklin and his little band are doing fine, although many of the more pampered nomes are having to get used to the idea of farming and living in a place with no heating and too much open space.
Then everything changes. A human brings a paper to the quarry, and the nomes learn that the quarry is going to be reopened -- and the nomes risk discovery unless they can find a new place to live. When Masklin ventures off to the mysterious Florida, to find the descendent of Arnold Bros., a fanatic called Nisodemus takes the opportunity to rally the nomes in rebellion. Just then, Dorcas (a sort of nome technogeek) reveals the Cat (a bulldozer), which might help them against the humans.