The writer Maurice Walsh
http://en.wikipedia.org/wiki/Maurice_Walsh used the castle
NH9736 : Inside the castle of the Wolf of Badenoch. and the loch in The Key above the Door and its sequel. He also used Terriemore Croft
NH9737 : The boathouse by Terriemore Farm, Lochindorb as the house with the eponymous key. He changed most of the names, but other places in the surrounding area can be identified. One name he did retain was Aitnoch.
NH9839 : Aitnoch Croft in Autumn.