I would take the Book Thief as it is in WW2 and I am in love with it!!!!
Right now I think I would take Sunne in Splendor because I like Penman and I'm curious about Richard, with the recent discovery of remains. Th e other alternative is Gone with the Wind, which I still haven't read :-(Outlander is a good pick as well and I loved the Book Thief, but if its anything like the first time that I read it, I would wash off the sunscreen with my tears!
All good suggestions so far. Maybe I would take Wolf Hall as I would be forced to read it and finish it if it was the only thing available to me!