In the Footsteps of Flora Tristan is the first ever study devoted to Jules Puech (1879-1957), and is a double biography that examines his life's work on Flora Tristan (1803-1844), feminist and socialist. It begins by examining newly found press reports of Flora Tristan during her lifetime and subsequently, then positions Puech's discovery of her, as a postgraduate student in Paris in the 1900s. It continues with an account of how he embarked on the first in-depth biography published in 1925. Puech was unmatched in his expertise as a writer on Flora Tristan having discovered her papers through his numerous political connections and having become a historian of Proudhon's legacy on the international aspirations of the labour movement. Together with his wife Marie-Louise Milhau (1876-1966), suffragist feminist, he was a militant in the early twentieth-century pacifist movement that advocated international arbitration. His research on Flora Tristan was enriched by his other projects but was thwarted by the wars of 1914-1918 and 1940-1945. The circumstances of the long gestation of Puech's biography are drawn from his letters and papers, hitherto unseen. The correspondence curated brings a new understanding to the multi-faceted nature of Puech's activism and rate of progress in the publication of his findings on his subject, Flora Tristan.