The friend rediscovered

Spoleto wakes up with shocking news: Don Matteo has disappeared under mysterious circumstances. Natalina, Pippo and Marshal Cecchini can't believe their eyes: behind the altar, reciting mass, they find Don Massimo, who calls himself the new parish priest and Don Matteo's replacement. But everyone is wary of him, even hostile. Who is Don Massimo? An impostor? And what happened to Don Matteo?