Comment by vintermann

I think you miss the point of this book. Karl had tuberculosis, Jonathan died saving him from a fire despite knowing Karl would soon die (which he did). No suicide there, only tragedy. Then they had an "afterlife" which is full of the adventure they wished they had when they were alive - which also means that there's some serious darkness there to fight, so not heaven by any means. In the end, Karl gets to do for Jonathan essentially what he did for him, and they're ready to move on. They didn't commit suicide, they were already dead. I don't think a single Swedish kid killed themselves over misunderstanding this book, they didn't miss the part that the brothers really treasured life and it was a tragedy that they died in the first chapter.