In an article for Writer’s Digest, author Stephanie Marie Thornton offers her advice for creating believable spy characters.
Notably, she reminds writers that spycraft isn’t always glamorous work. A lot of their tasks are drudgery–visiting contacts, sifting through data. For that reason, a strong sense of curiosity and patience are necessary. Thornton also says the best spies are often normal people: average people who have access to important information. They should also have a strong motivation for wanting to enter this potentially dangerous world. Thornton suggests a few reasons in her article, which you can find following the link below.