Where are the Thieves?
Catch the thiefs who appear near the Ding family between midnight and 2am.
The thief is spawned near to the outer wall of the Ding’s manor.
The guards and dogs will not be able to detect the spawned in thief and he’ll be crouching and idling until you click on him.
This is applicable to all other “suspicious dudes” quest between midnight and 2am.