This quest is obtained by talking to Nadine in her house east of the fair in Baldur's Gate Central. She will ask Gorion's Ward to deliver an The Protector to her son Euric who has ran away. You can find Euric in Baldur's Gate Southeast in an unnamed inn. If you give him the amulet from his mother he will admit that he ran away from home, but he will also add that he doesn't want to return yet. After that return to Nadine to claim your reward.