The fisherman, the stabbing, the boy
In Vigàta, a Tunisian crewman on a Mazara del Vallo trawler is shot at sea by a Tunisian patrol boat on the same day a local businessman is stabbed to death in his building's elevator. Montalbano traces both deaths to a Tunisian woman, Karima, who has disappeared, and to her brother, a figure caught up in North African politics and handled by Italian secret services. Karima's young son François, left alone and hungry, survives by stealing schoolchildren's snacks, and that thread lets the inspector connect the local murder to a covert state operation.
