when people die they turn into a skeleton and sooner or later they turn into ashes leaving the answer to this question they turn into ashes and if ur saying what do people THINK when they die i dont know
people think about heaven and hell. also turning into something Else like turning into something like an animal or insect. people think there just die and don't do anything and also there is the thought of becoming ghosts and wondering the earth
a lot of people think that Jonas and gabriel die at the end. it is supposed to be left open so you can decide what you think happened. (i personally think that they found the elsewere that they were looking for and did not die) that is my personal opinion. it is supposed to be left open.