Fog is a fresh new translation of the Spanish writer Miguel de Unamuno's Niebla, first published in 1914. An early example of modernism's challenge to the conventions of nineteenth-century realist fiction, Fog shocked critics but delighted readers with its formal experimentation and existential themes. This revolutionary novel anticipates the work of Sartre, Borges, Pirandello, Nabokov, Calvino, and Vonnegut.

The novel's central character, Augusto, is a pampered, aimless young man who falls in love with Eugenia, a woman he randomly spots on the street. Augusto's...