Have you tried any of the John Shakespear books by Rory Clements?Amazon don't let me rummage before I buy!
John the brother of Will works for Francis Wallsingham. His intelligencer work in the setting of Elizabethan England makes for a truly great read, mixing fiction with fact they are great stories and I’m sure they won’t disappoint.
trying to put up a link but it won’t work. Any way you’ve guessed available on Amazon.