In 1937, a British-Belgian occultist arrived in Berlin to brief Heinrich Himmler on a secret society called the Green Dragon. Tracing his unbelievable claims, Chasing the Green Dragon dives into the interwar Parisian occult underground, where intelligence operators and esotericists mingled in the temple of the Polaires, Masonic lodges, and Maria de Naglowska's Luciferian salons, sometimes with fatal results.