On the surface, “Vita mortale e immortale della bambina di Milano” (“Mortal and Immortal Life of the Girl from Milan”), Domenico Starnone’s latest literary gem (Einaudi, October 2021), has a deceptively simple plot. It relays the wondrous deeds of a young boy, Mimì (short for Domenico) who has a morbid curiosity towards death and is also the protagonist of three tragicomic love affairs.