Kiss of the Spider Woman - Manual Puig

From Goodreads and Amazon: "In an Argentine prison, two men share a cell: Molina, a gay window dresser who is self-centered, self-denigrating, yet charming as well; and Valentin, an articulate, fiercely dogmatic revolutionary haunted by memories of a woman he left for the cause.
Sometimes they talk all night long. In the still darkness of their cell, Molina re-weaves the glittering and fragile stories of the film he loves, and the cynical Valentin listens. Valentin believes in the just cause which makes all suffering bearable; Molina believes in the magic of love which makes all else endurable. Each has always been alone, and always - especially now - in danger of betrayal”.