Dust is a very satisfying end to the Silo trilogy.

I don't want to go into any of the details of the story, because that would spoil your pleasure of reading the first 2 books. Definitely read those first, otherwise, much of this book will not make sense and it will spoil some of the surprises in the previous books.

If you liked the other two books in the trilogy, you owe it to yourself to read this one too.