"NATO's Secret Armies" is an insightful investigation that sheds light on the secret activities of the CIA and the British intelligence service in collaboration with NATO and European military intelligence agencies after World War II. This study reveals how a network of secret, anti-communist armies was established in Western Europe, trained on remote islands in the Mediterranean and in unconventional warfare centers in England and the USA. The secret soldiers, equipped with state-of-the-art gear and weapons, conducted covert operations ranging from political manipulation to violent assaults. The revelations about the Italian secret army "Gladio" and the associated "stay-behind" armies in several European countries illuminate one of the best-kept and most damaging political secrets of the post-war era. This captivating narrative is both informative and provocative, prompting reflection on the dark sides of geopolitical strategies.