This thriller is based on the still politically sensitive story of the assassination of General Francisco Franco's heir apparent General Carrero Blanco. The General was to have been kidnapped by the Basque separatists, but when that proved too difficult, they arranged to bomb his car (with him in it) to smithereens. In order to do this, they had to dig a tunnel under a city street. The ensuing explosion blew the car over the roof of a nearby house.
by Clarke Fountain synopsis