Tom Tobin and the Bloody Espinosas — Bob Scott

The year is 1863, a time of great violence. Most of America and the world are focused on Gettysburg and Vicksburg. Westerners split their attention between the Civil War and the Great Plains Indian War, then nearing its height. In the Colorado Territory, though, there is another and even more terrifying event demanding attention--the world's first serial killers are stalking the Rockies, brutalizing any person they find. Two brothers kill more than 30 men--and when one of the brothers is killed, a 12-year-old boy joins the murderous team to continue the slaughter. Hundreds of soldiers, lawmen and volunteers are unable to stop the rampage. That's when the Army calls in Tom Tobin, perhaps the best tracker who has ever lived. Using incredible skills of deduction and observing, Tobin does what no one else can: he identifies the killers, follows them through the wilds, and then faces them in the ultimate showdown.