Muchalls Castle near Stonehaven, East coast of Scotland;
former B&B, now private residence.
Cairnwell in Pursuit And Persuasion.
"...A heavy oak door with rivets around the outside edges was set at a diagonal across that corner, and Ben rapped on it twice with the long brass knocker, while he studied the crest above the frame. He thought about pulling the thick braided rope on his right, but the high bronze bell looked large enough to startle every farmer in the neighborhood. And he decided to look for Ellen on the grounds ..."