Full Idea
Propositions are true at possible worlds in much the same way as they are true at books: by being implied by the book.
Gist of Idea
The truth of propositions at possible worlds are implied by the world, just as in books
Source
Joseph Melia (Modality [2003], Ch.7)
Book Reference
Melia,Joseph: 'Modality' [Acumen 2003], p.155
A Reaction
An intriguing way to introduce the view that possible worlds should be seen as like books. The truth-makers of propositions about the actual world are items in it, but the truth-makers in novels (say) are the conditions of the whole work as united.