In 1957 Barcelona, Daniel Sempere's world is disrupted when a mysterious stranger visits his family bookshop. This encounter unearths the terrifying past of his friend, Fermín Romero de Torres, revealing his secrets as a political prisoner in Montjuïc Castle. As long-buried truths come to light, the story connects the fates of the Sempere family with the dark history of the city and the enigmatic Cemetery of Forgotten Books. This thrilling novel explores themes of loyalty, revenge, and the enduring power of friendship against a historical backdrop.