On the night of August 17, 1959, Irene Bennett Dunn was camped with her husband and four children on the banks of the Madison River near Yellowstone Park when an earthquake of 7.5 magnitude hit. The quake unsettled the mountainside above their camp with devastating results. A massive landslide swept over the campground, damming the Madison River and creating a new lake. Irene survived along with her 16-year-old son, Phil, but the rest of her family...