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https://tvtropes.org/pmwiki/remarks.php?trope=Literature.TheClubDumas#latest is where I'm starting from with this.
Specifically, Varo Borja wants to bring up _The Devil_—-cue echoing with clouds of smoke—-so that he can Sell His Soul, and whatever from there.
Lucas Corso just wants to research and sell books. In the end, it's Lucas who finds out what the source of the old legends really is, and at the end of the novel, is apparently on his way to becoming the same himself.
—-But I have no idea if there is a declared trope, or if there is, what it's called.