While in San Quentin, serving a sentence for armed robbery, Jarvis Jay Masters was set up for the murder of a guard --- a conviction that landed him on death row, where he’s been since 1990. At the time of his murder trial, he was held in solitary confinement, torn by rage and anxiety, felled by headaches, seizures and panic attacks. A criminal investigator repeatedly offered to teach him breathing exercises, which he initially refused --- but then desperation caused him to change his mind. David Sheff describes Masters’ gradual but profound transformation from a man dedicated to hurting others to one who has prevented violence on the prison yard, counseled high school kids by mail, and helped prisoners --- and even guards --- find meaning in their lives.