The Living and the Dead by Boileau & Narcejac

Flavierès had seen at once that the cordiality was slightly put on, as though the scene had been rehearsed beforehand and then just a little overplayed. Gévigne was fidgety, his laugh too loud. Not much. Oh no! If the note was wrong, it was only by a fraction of a semi-tone, yet Flavierès could feel instinctively that the other was not altogether at ease. He wanted at a blow to wipe out the fifteen years that had passed, years which had changed them both physically. Gévigne was almost completely bald and his chin had lost its clean line. His eyebrows had turned rusty in color, and there were now freckles at the side of his nose. As for Flavierès, he was not only thinner, but, since his trouble, had acquired a stoop. And his hands were clammy at the thought that Gévigne might ask him why he was now practicing as a lawyer, considering that he had studied law to go into the police.