During the Interwar period, Greeks who had been recruited by German secret services arrived in Greece from Germany. Greeks who had been dazzled by Germany of the 1930s and were ready to offer land and water to the New Order that had dawned in their new homeland. These people, along with those who had already been recruited in Greece, formed the yeast from which those who manned the services of the Abwehr, the SD, and the GFP during the German Occupation were leavened. Personalities like Peri Nikolaï emerged like Gods and Valkyries from Scandinavian mythology. This research follows their faint traces from the Interwar period to the wounds they left on the national body during the German Occupation. Their actions not only obliterated the Jewish community of Thessaloniki but also dealt significant blows to the Allied espionage networks. Peri Nikolaï, from oblivion, takes flesh and blood through the pages of this research.