This quest is started by talking to Quinn inside his house in Baldur's Gate Northwest. He will tell Gorion's Ward and their party that he and his friend, Nester, were attacked by ankhegs, which killed his friend. He asks the player to retrieve some of Nester's belongings, so that his mother has something to bury. You can find Nester's Dagger in the north-eastern corner of Wyrm's Crossing in the possession of an ankheg. After you have acquired the dagger, go back and speak to Quinn to get your reward.