Moon Over Manifest by Clare Vanderpool

Abilene Tucker has been sent to the town of Manifest, Kansas during the Great Depression.  She is loosely taken care of by a 'pastor' who also runs a speak-easy.  She loses the compass her father had given her and looks in the one place everyone warned her away from - a house named the Road to Perdition, where a diviner lives.  She agrees to work for the woman in exchange for getting the compass back.  But there is far more to the town and its history than meets the eye.  A man who owns most of the town and its mine gets tricked into selling land that allows the town to buy back its rights.  The book is well written and worth the read.