John Buchan 
Huntingtower 

Huntingtower is a 1922 novel by the Scottish author John Buchan. It is the first of his three Dickson Mc Cunn books. The action takes place in Scotland, in the district of Carrick in Galloway. Having sold his Glasgow grocery-store business, 55-year-old Dickson Mc Cunn decides to start his retirement with a walking holiday in the district of Carrick in Galloway. At a local inn he meets John Heritage, a poet and ex-soldier, as well as an unnamed young man who asks after a place called ‘Darkwater’ that nobody has heard of… (Excerpt from Wikipedia)