The Dance of the Serpents: The Brand New Frey & McGray Mystery (A Frey & McGray Mystery)

There are many bad days in Edinburgh police's subdivision 'The Commission for the Elucidation of Unsolved Cases Presumably Related to the Odd and Ghostly'. And in the pantheon of the worst days - today takes the podium.
Because the English Inspector Ian Frey, and his Scottish boss 'Nine-Nails' McGray are called into a meeting in the middle of the night with none other than the Prime Minister himself.
And he tells them that Queen Victoria - the most powerful woman in the world - wants them both dead.