The party travels south in the direction that Torn's captors came from. They pass through a large empty cave (room 70). They go south from the large cave and come to a Y intersection. Looking in the distance, you can see that 60' from the Y intersection are two torch-lit caves, the southeastern cave appears empty, the southwestern cave appears to have a stone tower that reaches to the ceiling of the cave.
Torn vaguely recalls having seen guards on the tower when she passed this way earlier. Its possible that guards could be in either or both caves, but you don't see movement or hear voices.