The Unexpected Mrs. Pollifax is the first in the almost outrageously cute Mrs. Pollifax series by Dorothy Gilman. I don't usually go much for cute/cozy, but I've really enjoyed this series in DTB, maybe for the venues (which is something that makes me tend to like books) or maybe just because they are really fun.
The series does have a distinct cold-war bent to it, so you need to remember (or at least be aware of) cold war politics and geography, but so long as you regard them as "recent historicals", rather than something contemporaneous (as they were when published), I think they are still very enjoyable. Anyway,
Unexpected has dropped to $1.99 at Kindle US.
link:
https://www.amazon.com/Unexpected-Mr.../dp/B00HP3Q51S