Passenger by Andrew Smith JUST FUCKING AWESOME
Passenger the second and final book from The Marbury Lens
... you guys READ IT!
Holly mother of Marbury... I cant say i didnt see that ending coming but OMFG i wasnt really expecting that to happen.... This book mess up with your head even more that Marbury Lens, it's so confusing and yet you want to keep reading no matter what to see WTH is going on, going back and forward between worlds or not-worlds, understanding why everything happens and understanding the meaning of friendship.. I really liked this series and i hope someone decides to make it into a movie or something.
The book left a lot of thing unanswered but that's kind of the idea you asking What and why and who? Everything has a reason and that reason you will have to guess.