Would you recommend querying for a duology by pitching the two books together or just for the first book "with potential/plans for a duology/sequel?"
If the former, would I be correct in assuming the expectation would still be to have the first book's manuscript completed & preview chapters taken from that, rather than to have both manuscripts complete?
How to query a duology or a sequel
The answer really depends on whether it is a duology or a sequel.
A duology consists of two books that each have their own finished storyline AND share one overarching storyline. You can't leave book two unpublished without making readers unhappy. Narratively, a duology is two elements, together forming one bigger element.
A sequel is something completely different. A sequel takes (elements of) the storyline, or the universe, or (a) character(s) from a/the previous book and starts a new story.
For example: look at the Hunger Games series. Book one is a standalone, book two is a sequel and forms a duology with book three. You can stop reading after book one and feel narrative closure, but you won't feel closure between book two and three.
Btw, this is not a duology: The storyline is not finished after book one. The book was getting really big though, so you decided to cut your 130k fic in two books.
--> If it's a duology:
Having both manuscripts finished and polished before you query vastly increases your odds, because the publisher is buying both books at once and needs to see if you can perform.
--> If book one is a standalone and book two is the sequel:
The publisher will want to decide to take his chances with book one first and base his decision about publishing book two on how book one performed. Query book one separately, and mention the killer outline and killer pitch you prepared for the sequel.
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I hope this was helpful. Don’t hesitate to ask me any questions, and happy writing!
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