An infectious epidemic of animal origin, following the consumption of infected dairy products, broke out in Gubbio and the situation immediately revealed itself to be dramatic. Laura, the mayor, is in danger of life and Captain Anceschi is shocked. It's up to Don Matteo to instill courage and hope in his community, improve the lives of Titti, his father and the man they hold responsible for their mother's death. The person responsible for the bovine contagion turns out to be the veterinarian, who falsified the bovine registry for 14 animals from Romania.
