Jean-Francois Abgrall was an adjutant in the Rennes homicide squad when he started investigating the murder of Aline Perez. By the time it was over he was famous throughout France. His book, Inside the Mind of a Serial Killer, was made into a successful drama by French television, with the actor Thierry Fremont winning an Emmy for best international actor. After leaving the police force, Abgrall he set up as one of the only French private detectives licensed to investigate serious crime. He has worked on other celebrated cases since the Heaulmes affair – including tracking down another serial killer in the South of France – and also lectures on criminal psychology at the University of Rennes.