Honestly I don't know if there really is a RULE for readers but I'm making this serious RULE right now!!!
"WHEN YOU SEE SOMEONE READING A BOOK THAT YOU HAVE READ,
DON'T BE A BOOK MURDERER BY TELLING THE ENDING OF THE STORY or ANY OTHER PART OF IT FOR THAT MATTER UNLESS ASKED!!
IF SHE'S HOLDING THE BOOK IN HER HAND TO READ, SHUT YOUR GAB AND DON'T ASSUME SHE KNOWS THE ENDING CAUSE IF SHE DID, SHE WOULDN'T BE HOLDING THE BOOK AT ALL, NOW WOULD SHE??!!!"
So to EVERYONE OUT THERE, please don't ruin the suspense or surprise of the novel for the other reader, don't give away what the writer so beautifully have kept for the reader to discover! Buying the book, and having someone else tell the story is completely POINTLESS!!!