In answer to the OP's question, there are so many I will give a list of my favourite Scots authors and works of prose fiction that I enjoy most:

Robert Louis Stevenson (Kidnapped, Catriona, Master of Ballantrae, Weir of Hermiston)
Neil Munro (The New Road, Doom Castle, John Splendid, Para Handy Tales)
James Hogg (The Private Memoirs and Confessions of a Justified Sinner)
Ian Rankin's Rebus novels
Lillian Beckwith's Hebridean novels
Finlay J. MacDonald's trilogy (Crowdie and Cream, Crotal and White, and the Corncrake and Lysander)

Not an exhaustive list but among my personal favourites!