Brain-Racking Time

There's a literary device which I'm considering using in Peculiar Lives, which I'm certain isn't original. However, I cannot for the life of me recall where I've read it. On the basis that one should always be aware of who one's stealing from, I'm straining my brain to remember where, exactly, I've encountered this particular narrative pattern:

The book, narrated in the first person (and in an archaic style, although whether authentically or in imitation I don't recall), has a false ending which appears to bring the story to a close. Someone close to the narrator (very likely the book's central character) has left him (I believe it's a him), presumably forever. They may well have died, in fact. However, there is a final chapter / passage where the narrator returns in great excitement to writing the supposedly finished story, having just received a visit from the person in question, who has reassured him that all is well. There's some doubt in the reader's mind as to whether this is all a delusion or a dream on the narrator's part. It begins something like "It is with great astonishment / exhilaration / arousal / whatever that I resume my tale, which I had thought forever finished. For [insert name here] has returned to me, this very night!"

It doesn't seem to be from any of the books I thought it might be in. So, I'm opening up the question to the floor. Does this sound familiar, at all whatsoever, to anybody reading this? Or did I dream it?