Ciri's search led Yennefer to a local tavern, but she wasn't there, but there was her boyfriend's corpse. In any case, Yen can "pull" information even from the deceased.
P.S. It's not sex with a corpse if it was revived before that ;).
Link
https://mega.nz/file/L5tG2AgR#VDz_jLPPP8jC3jRPWvfJvtvmRFWvoEhlEqtLm9-QAN0