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To keep the number of genres manageable, subgenres are not included in the dropmenu.
Espionage items could be listed under Thriller/Suspense, Action/Adventure, Military, Political, and/or Foreign, as is appropriate.
To allow people to find your item by typing "espionage" into the search form, you can include that word in the item's Keyword field on the edit item page.
Hope that helps.