Hunt down some wanted criminals

Hunt down a thief
Go to the supply room. With enough wisdom, you will see a few slightly out bricks. Set a trap for the thief after.

Go to the armory room. With enough diplomacy? you can ask about the patter changed

Hunt down a local thug
Speak with merchants and customers to obtain a description of the thug. After that setup as a merchant. Trick him and you will receive the 500 gold.

Hunt down a group of cutthroats
With enough agility? you can trip the bandit

Hunt down an assassin
See who would benefit from his death

Discuss with record keeper (Diplomacy needed). You will not obtain many details regarding the poison

Discuss with his rival (Diplomacy needed)

Talking with the others will not give you any information.

Go back to him and when asked who did it