ETA member Argala settles in Madrid with the aim of attacking the Francisco Franco regime. At first he is alone because the hard core of ETA does not want to support his actions because they consider him a fool. In the end he gets the necessary support to help him 3 more members of the talde. The objective was to kill Luis Carrero Blanco, who, despite being recently appointed President of the Government, did not seem to have much personal security.