It was a markedly tedious task. First he would fashion a swab, using a blob of cotton wool and a wooden dowel; then he would dip the swab in solvent and twirl it over the surface of the painting-gently, Isabella explained to the others, so as not to cause any additional flaking of the paint. Each swab could clean about a square inch of the painting. When it became too soiled to use any longer, he would drop it on the floor at his feet and start the process over again. Margherita likened it to cleaning the entire villa with a toothbrush. “No wonder he’s so peculiar,” she said. “His work drives him mad.”

When he finished removing the old varnish, he covered the canvas in a coat of isolating varnish and began the final phase of the restoration, retouching those portions of the painting that had been lost to time and stress. So perfect was his mimicry of Poussin that it was impossible to tell where the painter’s work ended and his began. He even added faux craquelure, the fine webbing of surface cracks, so that the new faded flawlessly into the old. Isabella knew enough of the Italian art community to realize Signore Vianelli was no ordinary restorer. He was special, she thought. It was no wonder the men of the Vatican had entrusted him with their masterpiece.

But why was he working here at an isolated farm in the hills of Umbria instead of the state-of-the-art conservation labs at the Vatican? She was pondering this question, on a brilliant afternoon in early June, when she saw the restorer’s car speeding down the tree-lined drive. He gave her a curt, soldierly wave as he went hurtling past the stables, then disappeared behind a cloud of pale gray dust. Isabella spent the remainder of the afternoon wrestling with a new question. Why, after remaining a prisoner of the villa for five weeks, was he suddenly leaving for the first time? Though she would never know it, the restorer had been summoned by other masters. As for the Poussin, he would never touch it again.