On November 7, 1893, at the Gran Teatre del Liceu in Barcelona, the anarchist Santiago Salvador Franch carried out a terrorist attack that involved the release of two explosive devices from the fifth floor against the bourgeoisie who attended at that time to the performance of the opera 'William Tell'. With such action he would vindicate his companion and friend, the also anarchist Paulino Pallás Latorre. Over a hundred years later, intellectuals and historians experts in the subject are participating in this documentary to help recreate those facts with the help of their testimony.