From the publisher:
A series of four fantasy-adventure novels written by Andrew Peterson about the three Igiby children: Janner, Kalmar, and Leeli. They live in a world called Aerwiar (which is exactly like our world, except they don’t have electricity or gunpowder), and there are all sorts of creepy animals (like sea dragons and toothy cows). The children are about to discover that the ordinary little town where they live is anything but ordinary. In fact, the family is at the center of a great mystery that will change their lives-and their world-forever.