In the sidequest "Kidnapping" you help Penelope in Bavelock, whose son Amagus is kidnapped. Penelope tells you that the kidnapper had left a note demanding a ransom of 3000 Pix and that he was waiting in Blackwhisper Cave for the money.

You go there instead, defeat the Bandit and go back to Bavelock together with Amagus.
You talk to Penelope again and get a reward of 20 Pix for the help.