Although Lady Harris is acknowledged as the artist of Aleister Crowley's Book of Thoth, to date, most studies have focused predominantly on Harris's role as Crowley's 'artist executant'. Whitehouse argues that Harris's involvement extended far beyond the artwork itself. The Book of Thoth was a collaboration in which each partner fulfilled a variety of roles; building on Crowley's magical theories and practices, and Harris's artistic skills and social awareness that enabled her to promote and exhibit their work as it evolved. The author presents a study of Harris's life and works, seeking to assess her true contribution to Western Esotericism.