Good research and storytelling! Audiobook was also good. It's crazy to me how Charlie Cullen moved from hospital to hospital, killing an average of 22 patients a month according to one hospital's calculations, and none of those hospitals ever sought to have his license suspended... they all just wanted to sweep it under the rug and crossed their fingers that the deets wouldn't leak so they wouldn't get sued. The book makes a weak suggestion that because Cullen considered his mother's death to be from medical malpractice, he wanted to show how incompetent the medical authorities are. Obviously there was something much more pathological at play here, but if this was some part of his reasoning, he made a good point-- 5 hospitals accused him of gross negligence on the light end of the spectrum to premeditated murder on the other extreme, and yet it took nearly 2 decades, an estimated 300-400 murders, and an inside informant working secrectly against her employer to get him stopped? Yikes.