The Spanish melodramatic series "La Línea Invisible" is a historical saga set in 1960s Spain. The left-wing radical group ETA actively fights for the independence of the Basque Country. In the summer of 1968, the leader of the organization, Chabi Etxebarrieta, crosses the "invisible line" and commits a murder. 25-year-old guard Jose Antonio becomes the first of 853 victims of this group. This story is filled with pain, fear, and terror.