The Flight of the Heron

What would a young Highlander leave his home and his bride-to-be to follow? D. K. Broster's The Flight of the Heron, set during the 1745 Jacobite uprising under Bonnie Prince Charlie, is the first book in a trilogy and follows the intersecting fortunes of two men who at first glance seem almost complete opposites. Ewen Cameron, a young Highland laird in the service of the Prince, is dashing, sincere, and idealistic.
Major Keith Windham, a professional soldier in the opposing English army, is cynical, world-weary, and profoundly lonely. When a Highlander tells Ewen that the flight of a heron will lead to five meetings with an Englishman who is fated both to do him a great service and to cause him great grief, Ewen refuses to believe it. But the prophecy is proven true - and through many dangers and trials, Ewen and Keith find that they have one thing indisputably in common: both of them are willing to sacrifice everything for honour's sake!