I love Eva Ibbotson's books. The Secret Countess and A Song for Summer are both set in the 20th century. Also The Magic Flute.
Helen Dunmore's The Seige is a really good read too.
For something a little more adult, you can try Sebastian Faulks' Charlotte Gray if you don't fancy Birdsong, or you can read them both!
One of my all time favourites is Wild Swans by Jung Chang. It pretty much covers the whole of the twentieth century in China through the eyes of three generations of women. Quite a big read, but definitely worth it.
Last edited by cesca42; 01-06-2012 at 22:19.