She looked across at her husband, head buried in a file, trying to tease from it the truth, trying to find in the dry words, in the facts and figures, a human form. For in each of these manila folders there lived a murderer.

These were the unsolved murders. A few years earlier Chief Inspector Gamache had approached his opposite number in the Montreal Metropolitan Police and over cognac at the Club Saint-Denis had made his proposal.

‘An exchange, Armand?’ Marc Brault had asked. ‘How would that work?’

‘I suggest Boxing Day. It’s quiet at Sûreté headquarters and probably in your office as well.’

Brault had nodded, watching Gamache with interest. He, like most of his colleagues, had immense respect for the quiet man. Only fools underestimated him, but Brault knew the service was full of fools. Fools with power, fools with guns.

The Arnot case had proved that beyond doubt. And had almost destroyed the large, thoughtful man in front of him. Brault wondered whether Gamache knew the whole story. Probably not.

Armand Gamache was speaking, his voice deep and pleasant. Brault noted the graying of the dark hair at the temples and the obvious balding head, without attempt to comb it over. His dark moustache was thick, well trimmed and also graying. His face was lined with care, but also laughter, and his deep brown eyes, looking at Brault over his half-moon glasses, were thoughtful.

How does he survive? Brault wondered. Brutal as the world inside the Montreal police could be, he knew the Sûreté du Québec could be even worse. Because the stakes were higher. And yet Gamache had risen to run the largest and most distinguished department in the Sûreté.

He’d go no further, of course. Even Gamache knew that. But unlike Marc Brault, who was ambition itself, Armand Gamache seemed content, even happy with his life. There had been a time, before the Arnot case, when Brault had suspected Gamache was a bit simple, a bit beyond his depth. But he didn’t think that any more. He knew now what was behind the kind eyes and calm face.

He had the strangest feeling just then that Gamache understood everything that was going on, in Brault’s head and in the labyrinthine minds at the Sûreté.

‘I suggest we give each other our unsolved cases and spend a few days reading over them. See if we can find something.’

Brault took a sip of his cognac and leaned back in his chair, thinking. It was a good idea. It was also unconventional and would probably cause a stink if anyone found out. He smiled at Gamache and leaned forward again.

‘Why? Don’t you have enough work through the year? Or maybe you’re desperate to get away from your family at Christmas.’