In the front of an old building on Main Street in Hastings is a historical marker telling visitors a short story of the little town in southern St. Johns County. Behind the sign is a large coquina building that opened in 1924 and once housed the town's kindergarten through high school, and then the town's city hall. Now, in a small section of the building, it is home to a county library branch. For Greg Leonard, author of "Hastings: Florida's Potato Capital," the town behind the sign is what his book is about. "The sign gives you this kind of a glimpse about Hastings," Leonard said. "But if y...