Mr Standfast by John Buchan

I saw an old green felt hat, and below it lean tweed-clad shoulders. Then I saw a knapsack with a stick slung through it, as the owner wriggled his way on to a shelf. Presently he turned his face upward to judge the remaining distance. It was the face of a young man, a face sallow and angular, but now a little flushed with the day's sun and the work of climbing. It was a face that I had first seen at Fosse Manor.

I felt suddenly sick and heartsore. I don't know why, but I had never really associated the intellectuals of Biggleswick with a business like this. None of them but Ivery, and he was different. They had been silly and priggish, but no more--I would have taken my oath on it. Yet here was one of them engaged in black treason against his native land. Something began to beat in my temples when I remembered that Mary and this man had been friends, that he had held her hand, and called her by her Christian name. My first impulse was to wait till he got up and then pitch him down among the boulders and let his German accomplices puzzle over his broken neck.