It seems like the definition of true crime would be obvious: A story about a crime that actually occurred. Indeed, most true crime books explore dark and distressing subject matter, and reader discretion is advised. Granted, the first rule of true crime is that the narrative must include as many nitty-gritty facts about the case as possible: Readers expect the actual names of people involved and the correct time and place, information about what they did, and as many details of the crime and its investigation as the author can dig up.

True crime books can be about a single event, like a kidnapping. They can also be about the collective crimes of serial killers, thieves, or cult leaders. However narrow or broad the focus, the best true crime books deliver well-researched, finely written examinations of the case at hand.

But the wealth of details is just half of what makes true crime so popular with readers. The most talented true crime authors excel at presenting the facts of a case while vividly re-creating the atmosphere that surrounded the crime. They put criminals and their victims in context by establishing elements like the political climate of the day, the history of a town, or the struggles faced by a particular community. They dig into everyone’s motives, then weigh these motives against the actions and developments they document. They re-create dialogue as faithfully as possible, although of course sometimes it’s necessary to take artistic liberties.

In other words, the most popular true crime authors transport readers to the scene of the crime, with all senses fully engaged. Without an author’s narrative talents, the details of the crime would simply read like a legal report.