Blackwater Fever, the dark serial novel from half a century ago that is bursting into bookstores. "The response has been brutal," confesses Jan Martí, editor of Blackie Books.

Of the first four volumes of the series they have already sold more than 60,000 copies. This is the biggest launch in the history of a label known for hipsterizing Homero, Cervantes or Jardiel Poncela. More than 20 reading clubs throughout Spain discuss books and every 15 days, when a new delivery arrives.