Panlong - Ch. 200 - Season 2 Chapter 30

[MangaDex]

 

[Mangalover9000]

And what is it, Sherlock?!

 

[thegoatrider]

Oh my god it’s THAT... what’s that though?

 

[Kaarme]

If I'm not entirely wrong, one of the books is "The Lusty Argonian Maid". That must be the clue they were looking for.