Cover art
Thomas, Donald. Prince Charlie's Bluff. Macmillan 1974.

Thomas, Donald. Prince Charlie's Bluff
Divergence: 1758 CE
What if: Britain failed to capture (or even attack?) Louisburg in 1758, and a year later saw its attack on Québec end in disaster when French cavalry attacked from the rear on the Plains of Abraham.
Summary: Diary entries of a Scotsman who fought with the Highlanders at Québec, and then was present when Bonnie Prince Charlie arrived in Virginia, there witnessing the prince's negotiations with French forces threatening to conquer the colony, the prince's coronation as king of Virginia and the Stuart restoration, and finally the defeat of Hanoverian British forces outside Annapolis.
Comments: Subtitled "A Novel of the Kingdom of Virginia" on the hardback dust jacket, but not thus anywhere else.
Published: Macmillan 1974 (0333150422BUY).