Mysteries don't have any need for worldbuilding and readers don't expect character development (just like early SF) but they do expect the crime to be solved. Still, I can't stop myself from providing counterexamples:
There seems to be a hard limit of about 400 pages over in mystery.
Iain Pears, An Instance of the Fingerpost, 704 pages
Mysteries also eschew the cliff-hanger ending and the book-fragment approach
In Carole Nelson Douglas' Midnight Louie series, the primary love interest makes his first appearance in the final sentence of the fourth book. A later book opens with the main characters making a lengthy list of all the murders from previous books that hadn't been solved yet. I stopped reading when a fairly major cliffhanger was not resolved in the next book.
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There seems to be a hard limit of about 400 pages over in mystery.
Iain Pears, An Instance of the Fingerpost, 704 pages
Mysteries also eschew the cliff-hanger ending and the book-fragment approach
In Carole Nelson Douglas' Midnight Louie series, the primary love interest makes his first appearance in the final sentence of the fourth book. A later book opens with the main characters making a lengthy list of all the murders from previous books that hadn't been solved yet. I stopped reading when a fairly major cliffhanger was not resolved in the next book.