Hilda von Einem is a fictional character in John Buchan's 1916 novel Greenmantle. She is a German femme fatale who masterminds a plot to stir up a Muslim jihad against the Allies. She has been described as a "glamorous but merciless female agent"[1] and a "pale-blue-eyed northern goddess".[2] Rosie White suggests that von Einem is a "trope loosely based on Mata Hari" and that she represents a "decadent, oriental sexuality".[3]