Man from U.N.C.L.E. Section VII

Yes, I've read that one as well. There was another NCIS one I read that I really enjoyed but can't remember who wrote it or the title - Ducky was a cover identity for Illya which he took after he thought NS was killed - Ducky's mother was the innocent they were trying to protect. Gibbs had sometime in the past figured it out. There is a person stalking Ducky and it turns out to be NS. It was very good.