A young girl who attends Don Matteo’s catechism class falls ill. Her mother accuses an Egyptian man of having given her Ebola. When the man is found dying, the investigation begins.
Meanwhile, Cecchini is convinced teacher Marisa is pregnant with Tommasi’s child and tries to make amends while Don Matteo returns to Sabrina at the prison. He has managed to get her day releases to work outside the prison back.