'A stunning book... should and does bring to mind In Cold Blood' - New York Times After his arrest in 2003, registered nurse Charlie Cullen was quickly dubbed 'The Angel of Death' by the media. But Cullen was no mercy killer, nor was he a simple monster. He was a favourite son, husband, beloved father, best friend and celebrated caregiver. Implicated in the deaths of as many as 300 patients, he was also perhaps the most prolific serial killer in American history. Cullen's