Madeleine L’Engle 
And Both Were Young [EPUB ebook] 

Excerpt: "Where are you going, Philippa?" Mrs. Jackman asked sharply as Flip turned away from the group of tourists standing about in the cold hall of the Chateau of Chillon "I’m going for a walk, " Flip said Her father put his hand on her shoulder. "I’d rather you stayed with us, Flip." She looked up at him, her eyes bright with pleading. "Please, father!" she whispered. Then she turned and ran out of the chateau, away from the dark, prisoning stones, and out into the sunlight that was as bright and as sudden as bugles. She ran down a small path that led to Lake Geneva, and because she was blinded by sudden tears and by the sunlight striking on the lake she did not see the boy or the dog sitting on a rock at the lake’s edge, and she crashed into them."