"The firing squad of Penina", a book written in the 1970s, was destroyed during the last Argentine military dictatorship. Aldo Oliva, its author, never saw it printed. More than 25 years passed until someone found a copy, and Antonio, his son, began the path of re-edition, his steps behind those of his father, the reconstruction of the murder of the Catalan anarchist and the permanent glimpse of what was not known. can kill: our memory. The documentary accompanies Antonio's searches on two continents, touring Argentina and Spain.