In January a high-profile prosecutor was found in a pool of blood in his bathroom, days before he was due to release a report condemning the Argentine government. Wyre Davies examines claims that he was murdered and that the investigation into his death was bungled. Buenos Aires may be fading at the edges but it is still one of the world's great capitals - witness to some of the most tragic and momentous events in Argentine history. It is a city where military generals have justified coups d'etats, where grandmothers have marched in defiance against tyranny and where populist icons have vainly tried to unite a divided nation. Even today, intrigue and political scandal are never too far below the surface.