Context:

Referenced (as 'Green Mantle' by 'John Buckingham') when discussing rumors of French agents in the East during the hunt for Napoleon's fleet, comparing the scenario to Buchan's adventure novel.

Context:

Mentioned alongside The 39 Steps as one of Buchan's spy stories reflecting paranoid conspiracy theories of the era

Context:

Discussed alongside The 39 Steps as providing inspiration for Bond villains and female characters like Hilda von Einem