It was something in Dominique Pelicot's swagger, his "élan" - as the French might put it - that immediately struck the psychiatrist as odd.
There he stood. A 68-year-old pensioner who had already spent several months inside one of France's most notorious prisons, Les Baumettes in Marseilles. The prison was a grim, intimidating place, crowded with members of the port city's warring drug gangs.
And yet the man in the visiting room who rose to greet Dr Laurent Layet on a cold day in February 2021 seemed "clean, polished… He had just cut his own hair. He came towards me with this assertive attitude." Dr Layet was surprised, to put it mildly.
The psychiatrist was the first of many people to scrutinise Dominique Pelicot. Each expert was looking for clues to explain how this apparently genial pensioner could have committed such grotesque crimes and deceived his unsuspecting victim for so long.
In all his years interviewing hundreds of rapists and suspected rapists on behalf of French police and prosecutors, Dr Layet had never come across anyone quite like this grey-haired former electrician, calmly awaiting prosecution for drugging his wife Gisele and inviting dozens of strangers to rape her as she lay, unconscious, in the couple's bedroom.
"Something didn't fit. I had never encountered such an exceptional case," Dr Layet remembers thinking at the time.