The Shadow of the Wind by Carlos Ruiz Safo

One morning in 1945, a father takes his son to a mysterious place in the heart of the ancient city: the Cemetery of Forgotten Books. There, Daniel Sempere finds a book that changes his life forever, drawing him into a labyrinth of mysterious stories and buried secrets of a dark city. "The Shadow of the Wind" is a literary detective story that emerged in Barcelona in the first half of the 20th century, on the border between modernism and post-war literature.