"A unique and spellbinding memoir" by a New York Times–bestselling true crime writer who suddenly had to face a different kind of killer: ALS (Booklist).

In researching his acclaimed true crime books, Philip Carlo interviewed some of the most infamous criminals of our time in prisons and on death rows throughout the country. But what wasn't known to his many readers is that, while working on The Ice Man, he learned he had amyotrophic lateral sclerosis (ALS), a terminal illness that causes all of the muscles in the body to atrophy over time. Suddenly, after years of penetrating the minds of killers, Carlo found himself being pursued by the grim reaper. But rather than lying down and succumbing to the disease, Carlo continued to work.

In The Killer Within, Carlo documents his difficult experiences with ALS and explains how he managed to continue writing prodigiously in the face of adversity. The Killer Within is a gripping, suspenseful book that delves into the netherworld of Mafia bosses, Mafia hit men, and serial killers—as well as the hard realities of dealing with a fatal disease.