Espionage, also known as "spy fiction," is a subgenre of thriller that revolves around intelligence operatives and organizations. Classic espionage novels are frequently set in WWII, though contemporary settings are becoming more popular. Cold War conflicts have given way to convoluted terrorist plots.
Well-known authors include Alan Furst and John Le Carre.
If you write espionage, explore the subgenre to connect with other like-minded writers, workshop, and publish your book.