I'm not sure about any of the following.
Seen in a book in a bookshop, looked like quite an old story.
There are a lot of men who are duplicates of each other, clones maybe. They begin to disappear mysteriously one by one. I'm not sure whether they were seen to literally disappear or whether they just went out into the street and never came back. Someone investigates to find out what happened, but can't find out.
One of the duplicates (possibly the last man standing) escapes this fate for a while by staying indoors and never going out, but after some time tells the investigator that he can't stand hiding any longer "waiting for the goblins that get you if you don't watch out". (Which is a reference to a poem called "Little Orphant Annie" (sic), but searching for that doesn't seem to turn up the story). He says he'll go out and see what happens.
I'm not sure I read far enough to see whether he disappeared or not.
Anyone have any idea what this is?