From Compendium of Worldly Lore
Needs review
Source: Cityscape
Description: You can track down the location of missing persons or wanted individuals within communities.
Prerequisites: ,\sNone
To find an individual's trail, or to follow a trail for 1 hour, requires a Gather Information check. You must make another Gather Information check every hour you search, as well as each time the trail becomes more difficult to follow, such as when it takes you to a different part of town. The DC of the check, and the number of checks required to track down your quarry depends on on the community size and the prevailing conditions. If you fail a check, you can retry after 1 hour of questioning; the DM should roll the number of checks required secretly, so that the player doesn't know exactly how much time the task will require. You can cut the time between Gather Information checks in half: (from 1 hour to 30 minutes), but you take a -5 penalty on the check. Obviously, this feat will not allow you to locate someone who has gone beyond the boundaries of the community, but it could inform you that they've done so.