This Dark Endeavor (The Apprenticeship of Victor Frankenstein #1) by Kenneth Oppel
Victor and Konrad are the twin brothers Frankenstein and inseparable until Konrad falls gravely ill. In the forbidden Dark Library, Victor finds an ancient formula, and seeks an alchemist to recreate the Elixir of Life. With friends Elizabeth and Henry, he scales highest trees in the Strumwald, dives deepest lake caves, and each sacrifices a body part.a
Heidi by Johanna Spyri
At the age of five, little orphan Heidi is sent to live with her grandfather in the Alps. Everyone in the village is afraid of him, but Heidi is fascinated by his long beard and bushy grey eyebrows. She loves her life in the mountains, playing in the sunshine and growing up amongst the goats and birds. But one terrible day, Heidi is collected by her aunt and is made to live with a new family in town. Heidi can't bear to be away from her grandfather; can she find a way back up the mountain, where she belongs?