Un’anima persa is a novel by Italian writer Giovanni Arpino, published in 1966. The novel takes place in Turin in the 1960s and it is written in form of a diary, similarly to La suora giovane, one of the most famous works of the author's. Literary critic Lorenzo Mondo saw in this novel a representation of madness similar to the one described by Robert Louis Stevenson in The Strange Case of Dr. Jekyll and Mister Hyde. It was adapted for cinenam by Dino Risi as Anima persa in 1977. Source: Wikipedia (en)