I’m guessing InDesign Optical Spacing and negative tracking. “Tight but not touching” taken too literally. Evidence: ’nn’ and ’gu’ kerns.

My immediate gut reaction is that the lowercase “g” feels out of place. I will have to look up the face to confirm.

The “g”!?!?

Spot-on Norbert!! :^D
The g is set in Baskerville, while everyhting else is Bembo :^/
Feel free to continue the “quiz”, sharing all the gems you can find ;^)

(BTW, I did not make this up. It really exists and it’s out there!! I took it from a book cover found on Amazon)