"When you have experienced the Holy Ghost as I have, you would see that it is difficult to turn back." When the lively fervor of nineteenth century revivalism endangers the staid customs of the Amish community in the lush but rugged Kishacoquillas Valley of central Pennsylvania in 1847, the Amish church must deal with a divisive question: What is a genuine spiritual experience? The question turns personal when Susanna's beloved...