The principal questions addressed in this portfolio of eleven publications concern the reforms to French justice at the end of the twentieth and beginning of the twenty-first centuries. The portfolio is accompanied by a supporting statement explaining the genesis and chronology of the portfolio, its originality and the nature of the submission's distinct contribution to knowledge. The thesis questions whether the reforms protect the rights of the defence adequately. It considers how the French state views its responsibility to key figures in criminal justice, be they suspected and convicted criminals, the victims of offences or the professionals who are prosecuting the offences. It reflects upon the role of the examining magistrate, the delicate relationship between justice, politics and the media, breaches of confidentiality and the catastrophic conditions in which suspects and prisoners are detained in French prisons. It then extends its scope to a case study of the prosecution of violent crimes before the International Criminal Tribunal for Rwanda, and discovers significant flaws in procedures even at international levels. In concluding, it asks whether, given the challenges facing the French criminal justice system, French courts are adequately equipped to assure justice when suspects charged with the most serious international crimes appear before them under the principle of universal jurisdiction. The research, carried out over a number of years, relies predominantly on an analysis of French-language sources and represents a unique contribution to the understanding and knowledge of French justice for an English-speaking public at the turn of the twenty-first century.