In the shadowed streets of gothic Barcelona, 1957, Daniel Sempere and his wife Bea are celebrating their happiness. But their world is upended when a mysterious stranger visits the Sempere bookshop, leaving behind a chilling threat: a dark secret from the city's past is about to resurface.

Daniel and his close friend Fermín Romero de Torres are drawn into a harrowing adventure, plunging back to the 1940s during the early Franco dictatorship. As they unravel the enigma, they risk everything they cherish.

Their journey weaves through love, literature, passion, and revenge. Will they uncover the truth before it's too late? Their lives hang in the balance.