Because the book is a bestseller, used copies are abundant. Websites like and eBay often have copies for as little as $4–$6 including shipping. A physical copy allows you to take notes, highlight passages, and experience the book as a tangible object.

A third theme of the book is institutional failure. Cullen documents how the Jefferson County Sheriff’s Office ignored multiple warning signs—including a detailed criminal complaint against Harris for threatening a student and a bomb-making website he ran. On the day of the attack, police mistakenly treated the shooting as a hostage crisis rather than an active shooter situation, leaving victims to bleed out for hours. Meanwhile, the media amplified false stories: the Trench Coat Mafia, the “Rachel Scott’s faith” myth, and the idea that the killers had targeted specific people. Cullen shows that journalists repeated each other’s errors without fact-checking, creating a legend that persisted for years. His work thus serves as a case study in how sensationalism and cognitive dissonance shape collective memory.