A Matter of Loyalty by Anselm Audley, Elizabeth Edmonson

Hugo, Georgia, and Freya are back for a last adventure. This book was not quite as good which is explained at the end of the story. 

One of the scientists at the "Atomic" has gone missing. It is assumed that he is the one that was leaking scientific information which makes Sir Bernard very happy as he can close out that mystery with a sigh. At least, he could until the man's body shows up with a single gunshot wound in the neck. And Georgia and Polly are the ones to find him which shakes everyone up. 
Old favorites are included in this story. 
Saul Ingram is once again in hot water - he seems to be the easy target to point at for any number of sins
Uncle Leo-the priest and former spy
Aunt Priscilla- still managing  but lovable
New characters
Jarret - in from the Home Defense, was the best man at Freya's aborted wedding
Dr. Arpad Barandy - defecting Hungarian scientist staying at the castle
This was a good series and I liked how Edmonson was building on each successive story. I'm sad that we won't get to see the final stories. 

Three and a half stars

This book came out October 19, 2017

Follows A Question of Inheritance

Borrowed as Kindle audiobook

Opinions are my own