"Peter Manseau brilliantly captures a nation wracked with grief and hungry for proof of the existence of ghosts and for contact with their dead husbands and sons. It took a circus-like trial of Mumler on fraud charges, starring P. T. Barnum for the prosecution, to expose a fault line of doubt and manipulation. And even then, the judge sided with the defense?nobody ever solved the mystery of his spirit photography. This forgotten puzzle offers a vivid...