If you wrote a book you'd probably use a pseudonym. You have have to live as someone else with a fake identity. Witness Protection?
I can keep secrets but it would be so delicious to give chapter and verse of how "the enemy" was so easy to dupe and ridicule them. On the other hand the less said the better off I'd be to live a long life. Probably.
What would you do and why? Are you cut out to be a spy? Why?