In the prologue of “We Solve Murders,” the narrative begins with a fundamental rule for criminals: leave as few clues as possible. Engaging with people is, however, unavoidable when conducting business, whether it involves giving orders, arranging shipments, or carrying out lethal tasks. The protagonist emphasizes that isolation is not an option. In emergencies, there is a method to contact François Loubet, but doing so recklessly is likely to lead to regret.

The text then reflects on the nature of communication among high-end criminals, who rely heavily on encrypted messages and emails, akin to millennials. However, the author warns of the risks posed by sophisticated authorities capable of breaking encryption, suggesting that many skilled criminals have fallen due to the efforts of “nerds with laptops.” Thus, the importance of hiding one’s digital footprint is highlighted. For instance, François Loubet employs complex methods to mask the origin of his emails, ensuring that even the most determined hacker would struggle to trace them back to him.

Despite these precautions, the prologue notes the inescapable fact that individual writing styles have unique signatures. Each person’s choice of words and rhythm can reveal their identity—making them vulnerable. The text mentions the contrast between criminals and science, which often disrupts their plans. A pivotal solution is unveiled in the form of ChatGPT, which plays a crucial role in this narrative. It allows Loubet to erase his distinctive voice from messages, providing an element of anonymity. By prompting ChatGPT to rewrite his communications, Loubet effectively disguises his identity.

Thus, one could encounter numerous emails attributed to Loubet but remain ignorant of his whereabouts and true identity. While the activities of François Loubet would be evident, the mystery surrounding the man himself would persist, leaving authorities with little to act upon. The prologue sets the stage for a story where evasion and clever digital strategizing are crucial for survival in the criminal underworld.