In a quiet little town, the local pharmacist Arturo Manno, Luigi Pistilli, is infamous for chasing women, and so the death threats looming over him hardly surprise his circle of friends. Yet the warnings take a dark turn when Manno and his friend, Dr. Antonio Roscio, Franco Tranchina, are found dead during a predawn hunting excursion. As fear ripples through the community, suspicion immediately lands on Rosina’s family—the father and two brothers of Manno’s underage servant, Rosina, a detail that twists the town’s loyalties and tempers.
Professor Laurana, who has glimpsed one extortion note, refuses to accept that these illiterate men could be behind the scheme, especially since the letters have been put together with clippings from Osservatore Romano, a Vatican newspaper with only two local subscribers. Determined to uncover the truth, Laurana enlists his lawyer friend Rosello, Gabriele Ferzetti, and begins a careful, and increasingly dangerous, investigation. His motive is deepened by a private ache: his hidden love for Luisa Roscio, the widow of Manno’s murdered companion. Laurana’s path toward justice is complicated when Roscio’s father, who had opposed his son’s marriage to Luisa, entrusts Laurana with Roscio’s diary, a document that is missing pages and may hold vital clues.
From a trusted ally—a friend who sits on Palermo’s city council—Laurana learns that Roscio had lived in fear because he was gathering evidence against a corrupt prominent citizen in Laurana’s hometown. Roscio himself had been convinced that the death threats against Manno were a smokescreen and that he, Roscio, might be the real target. Luisa, for her part, rejects Laurana’s romantic advances but appears to back his quest for the truth, hinting at a deeper involvement by her cousin Rosello in the tangled case.
Laurana presses on and eventually meets Rosello, who drives him to a shadowy rendezvous. Realizing his life is at risk, Laurana pretends to have left behind a diary detailing his research in Palermo, a bluff that only fuels Rosello’s fury as he dumps Laurana back in the village. The next day, Laurana tells Luisa that the supposed diary never existed, a confession that does little to calm the peril surrounding them. Luisa guides him to a seaside spot where she finally ends their tense exchange by walking away after another blunt refusal.
Tragedy strikes when a group of local men brutally beats Laurana, killing him and allowing his body to disappear. In the aftermath, Rosello and Luisa marry, an event watched by acquaintances who quietly question the plot and wonder at Laurana’s optimism and naivety. The tale leaves the town haunted by the fear that truth and justice have been outmatched by fear, power, and a community’s uneasy complicity.