Can a government manage a crisis without a National Security Council and effective Intelligence Services? Can Ministries and Regions govern without considering the National Security Strategy? Can Members of Parliament effectively perform their duties as members of "sensitive" Parliamentary Committees without knowing the institutional framework of National Security? Can criminal trials related to National Security cases be conducted where state secrets are exposed to public view and hearing? National Security is a collective term related to National Defense and the demographic problem. Energy security and critical infrastructure. Economic security and social cohesion. Terrorism and counter-espionage. Political and religious extremism, as well as cybersecurity. And the question is: Does Greece today have the appropriate National Security Architecture to face the threats of the 21st century? The book - unique in its kind in Greek literature - is the first STUDY - FRAMEWORK for National Security, presenting the National Security Councils of six countries (USA, Russia, China, United Kingdom, France, and Turkey), the existing National Security framework in Greece, as well as the institutional changes that need to be made in the executive - legislative - judicial power. The case of wiretapping and malicious software, the tragedy of Tempi, the actions of the Russian spy are just a few of the cases that demonstrate the alarming situation prevailing in Greece on National Security issues. To stop saying "it's the fault of the (X) country," let's finally decide to fortify our Homeland with the appropriate institutions. Time for action...!