For a long car journey.
Done Harry Potter. Done Hunger Games. Someone on another thread recommended The Hitch Hiker's Guide To The Galaxy which would have been spot on except DH says he's read/listened/seen it and wants something new.
Kids are 4, 9 and 10 but really, probably only the 11 year old will pay any attention to it.
Any ideas? Maybe something not exactly aimed at young adults but that could be enjoyed by younger folk IYSWIM?