New on Archive.org, a comprehensive plot-annotated checklist of ‘Bibliomysteries’, from the mid 1980s and published in the fine Armchair Detective journal. These being mystery novels across various genres which centre on rare books, book collectors, old bookshops and suchlike.
* Part Two.
Even if you don’t care to track down and read any of these, just reading over the abundant setting/plot details could be useful for spurring fresh ideas about plot elements for Mythos fiction or for RPGs.
Note that Part One is immediately followed by a short survey of “The Science-Fiction Detective Story”, up until that time.