The Night That Changed Everything by Kristopher Rufty

Vincent Carlson used to have a good life. He lived on a small farm in Doverton, Wisconsin, with his loving teenage daughter, Leanne. His biggest worries were tending his corn crop and being a good dad to Leanne. But that was before the seedy little carnival came to town, bringing with them the tiny humanoid creatures called “Haunchies”. For Vincent Carlson—and the whole town of Doverton—that was the night everything changed.