This is book number eleven in the Mrs. Pollifax series; I just found it at the library book sale and remembered how I'd enjoyed the Mrs. Pollifax books in the past. I got the next couple of books in the series to read too.
These are fun mysteries about an old lady who goes to work for the CIA, with her only (seeming) advantage being that she is last type of person one would expect might be a spy. Start with book #1 if you are interested, The Unexpected Mrs. Pollifax.
I also read by this author: Mrs. Pollifax and the Second Thief