Sometimes core international crimes are only investigated and prosecuted decades after the relevant conduct took place. This has been the case in Bangladesh, Cambodia and Timor-Leste, to mention three examples discussed in this book. It addresses challenges associated with such delayed criminal justice and the evidence it must necessarily rely upon. It draws on contributions by some of the most experienced prosecutors and judges in international criminal justice as well as leading academic experts, on questions related to 'old evidence'. This revised and expanded second edition (2024) brings together contributions by Shafique Ahmed, Andrew T. Cayley, David Cohen, Seena Fazel, Siri S. Frigaard, M. Amir-Ul Islam, Md. Shahinur Islam, Moa Lidén, Agnieszka Klonowiecka-Milart, Mahdev Mohan, Alphons M.M. Orie, Stephen J. Rapp, Sriyana, Anya Topiwala, Patrick J. Treanor and Martin Witteveen, in addition to the editors Morten Bergsmo, Cheah Wui Ling and Antonio Angotti. The chapters discuss challenges encountered in practice and suggest solutions that can be tailored to fit the circumstances of the case or country. By providing a comprehensive analysis of the main problems in this area and a variety of views, the anthology serves as an invaluable resource for criminal justice actors and researchers seeking to address questions of 'old evidence'.