 Throughout the 1970s under his pseudonym Lieutenant X, Volkoff published stories for teenagers in the "Langelot" series of Hachette's Bibliothèque verte imprint, featuring the adventures of the eponymous hero, a young French secret agent.In these works Volkoff showed his taste for romantic intrigues and plot twists, and his profound understanding of the balance of forces prevailing in the world.In the later 1970s, with the standoff between East and West a constant reality, Volkoff's writings analyzed the ideological combat between two opposing conceptions of the world and of freedom with a solid geopolitical background.