Short, Simple, No Spoilers
Read great reviews on this one, so settled in to hear details about purposeful selection and murder of patients. What I discovered much to my delight and horror was the opposite. Charles Graeber writes from the perspective of a floating, non-judgmental narrator taking you through the events. I (and probably most of us) wanted to believe there was a reason he killed so many people. Was it for mercy or prejudice or hatred or a childhood traumatic event. When the answer is no, the story becomes creepier.
My advice is not to read too much detail from the summary and especially other reviews giving you play-by-play analysis. There is no gore, the shock factor is a slow build. Listen and let the story unfold walking you through the hospital, a place of trust with administrators, nurses, and the mystery of medicine. Was this the perfect storm for a serial killer? You decide.