This book is the last and final part of the project European Investigation Order - legal analysis and practical dilemmas of international cooperation - EIO-LAPD in the EU Justice Programme. It presents a contribution to the European-wide discourse on how to enhance the effectiveness and the practical implementation of the Directive 2014/41/EU on the European Investigation Order in Criminal Matters of the European Parliament and of the Council of 3 April 2014 (EIO). Through national reports (Part I), the analysis of selected topics (Part II), and shorter case comments (Part III), the book's objective is to equip target groups with specialised knowledge about the cross-border evidence gathering procedure described in the Directive 2014/41/EU. Unlike other parts of the project, this monograph is targeted at the legal community, students of law, NGOs and the interested public. Its goal is to achieve a greater inclusion of dilemmas connected with the practical application of the Directive into the legal and public discourse.