After his December 2003 arrest, nurse Charlie Cullen wasquickly dubbed "The Angel of Death" by the media. But he was no mercy killer nor a simple monster. But he was perhaps the most prolific serial killer in American history, implicated in the deaths of as many as 400 patients.

Cullen's murderous career spanned sixteen years and ninehospitals. Now, in a riveting piece of investigative journalism, Charles Graeber uncovers how Cullen gamed the system, and tells the unbelievable true story of the confidential informant asked to risk her life and career to betray a friend and finally stop a serial killer. Based on extensive never-before-seenevidence and years of exclusive jailhouse conversations with Cullen himself.

THE GOOD NURSE is a mesmerizing and irresistibly paced portrait of medicine and madness. This book will make you look at hospitals and the people who work inthem in an entirely different way.

Journalist and author, Chales Graeber is my guest today onMurder Most Foul.