I think that authors' ghosts creep back
Nightly to haunt the sleeping shelves
And find the books they wrote.
Those authors put final, semi-final touches,
Sometimes whole paragraphs.
Whole pages are added, re-written, revised,
So deeply by night those authors employ
Themselves with those old books of theirs.
Explain the fact that maybe after years
have passed, the reader
Picks up the book - But was it like that?
I don't remember this . . . Where
Did this ending come from?
I recall quite another.
Oh yes, it has been tampered with
No doubt about it -
The author's very touch is here, there and there,
Where it wasn't before, and
What's more, something's missing -
I could have sworn . . .
by Muriel Spark
(I found this in New Writing 13, edited by Toby Litt and Ali Smith. This is a phonomena I'm well familiar with - aren't you?)