What happened at the ending of this novel, dream or real events?

[William.J]

I just finished a novel with a famously ambiguous ending, and I can't decide what actually happened to the main character. I've re-read the final chapter three times, and my friend and I have completely different interpretations about whether it was a dream sequence or a literal event.

[Jerry5]

That final paragraph hit me hours after I finished. I read it aloud, and the line just hung there like a breath—no verdict, no wink, just open air.

[Tyler.P]

I tried mapping the recurring images water doors the train car and every pass pointed to a different outcome. The clues keep rearranging themselves.

[GraceR]

I kept questioning whether I trust the narrator to tell me the truth at the end. I skimmed for markers that would reveal it was a dream sequence, and I kept finding red herrings.

[Olivia.P]

Do you think the problem is the ending or something earlier in the book?