Sam Holland writes: “At this precise moment, there are over 100,000 true crime books listed on Amazon. The choice is mind-blowing. I cannot claim to have read even a fraction of these, but I know from experience that some are incredible. When I was writing The Echo Man, I made my way through over two dozen serial killer biographies, and many more on the subject of criminology and psychopathy. I demolished true crime podcasts and countless documentaries; I must be one of few who sit through these with a notebook. So, here are my favorites.”