In the bar at Ponte dei Greci, Bambola, the Senegalese helper Sergio had hired last year, was behind the bar. Both Brunetti and Vianello were accustomed to seeing Sergio there: robust, gruff Sergio, a man who had, over the decades, surely overheard — and kept to himself — enough police secrets to have kept a blackmailer in business for decades. So accustomed were the staff of the Questura to Sergio that he had achieved a state approaching invisibility.

The same could hardly be said of Bambola. The African wore a long beige djellaba and a white turban. Tall and slender, his dark face gleaming with health, Bambola stood behind the counter looking rather like a lighthouse, his turban reflecting back the light that shone in through the large windows that gave out on to the canal. He refused to wear an apron, but his djellabas never showed a spot or stain.

As the two men entered, Brunetti was struck by the increased brightness of the place and looked up to see if Bambola had turned on the lights, hardly necessary on a day that gleamed as did this one. But it was the windows. Not only were they cleaner than he had ever seen them be, but the posters and stickers for ice-cream, soft drinks and different makes of beer had all been peeled or shaved away, an innovation which redoubled the light that flooded into the bar. The windowsill had been swept clean of old magazines and newspapers, nor was there any sign of the fly-specked menus that had lain there for years. Instead, a white cloth ran from end to end, and in the middle rested a dark blue vase of pink strawflowers.

Brunetti noticed that the battered plastic display case which, for as long as he could remember, had held pastries and brioche had been replaced by a three-tier case with glass walls and shelves. He was relieved to see that the same pastries were there: Sergio might not be the most rigorous of housekeepers, but he understood pastries, and he understood tramezzini.