While the city and University of Cambridge, England, are of course real, as are Scotland and Cornwall, I have entirely invented the characters in this book who act out their imagined lives against these beautiful backdrops.
Peterhouse likewise exists, but DCI Arthur St. Just is not a real-life alumnus of that hallowed seat of learning.
In some cases, I have invented a village or manor house, such as Newton Coombe and Waverley Court, and placed them somewhat randomly in Cambridgeshire.
And there is now a castle in Scotland that exists only in my imagination.