Any advice on knowing when you've truly ended a book. I'm not talking about drafts but the actual ending. I thought I had a fitting one, but six weeks later, I can see it's a bit abrupt and doesn't explain too much. I can come up with several scenarios for another chapter. Or does that final added chapter often serve only to tie things up too much, explain what most readers would intuit. Which do you prefer-the abrupt but surprising ending or one that lays things out more. What novel do you remember as ending especially well.
(The novel is a sort of suspense story.)