I asked this question a while back, so I beg pardon in advance for repeating it. What's in the writer's best interest to say when an agent asks for a writing game plan, and the writer doesn't plan on any more books?
Ya, that's Miss Snark quivering in the corner avoiding the question.
An author I love very much, and who is as charming in real time as he is on the page, John Dunning once told me he never takes an advance or a contract until a book is done. He's never sure if he can actually write another. He's written four or five now I think; when he told me that he'd written three and it was some years ago.
You're not the first author who wonders if there will be another. I saw Christopher Kennedy Lawford interviewed over the weekend about his memoir; he said if he ever wrote another book it wouldn't be a memoir cause he'd said all he had to say in this one.
Tell the truth. And don't sign a two book deal. But know, also, that you never know what will stir your creative elves and get them dancing around on the keyboard.
It also reminds me of a dreadful joke:
Nikki Hilton: "Paris, I'm trying to figure out what to get my boyfriend for Christmas. I thought maybe I'd get him a book."
Paris Hilton: "Oh, don't do that. He already has one".