Start with high-confidence scottish history books, then narrow by subgenre or adjacent topics.
Century of the Scottish People: 1830–1950
T. C. Smout
The British Revolution, 1629-60
Allan I. Macinnes
The Debatable Land
Graham Robb
The Highland Clans
Alistair Moffat
Scotland
Magnus Linklater, Fitzroy Maclean
Before Scotland
Scotland's Forgotten Past
How the Scots Invented the Modern World
Arthur Herman
The Jacobites
Daniel Szechi
Kings and Queens of England and Scotland
Plantagenet Somerset Fry
The Royal Stuarts
Allan Massie
Clanlands
Sam Heughan, Graham McTavish
Rick Steves Scotland
Rick Steves, Cameron Hewitt
Scotland's Stories
Graeme Johncock
The Lost Flock
Jane Cooper
