300 Pieces of Silver is an unmarked quest in Fallout 3. If the Lone Wanderer tells Moriarty that they don't have 100 caps to buy information on their father, he will give them a cap-earning task. He wants the Lone Wanderer to find a woman by the name of Silver and get his money back from her. She is located northwest of Megaton at Springvale, inside a ranch house.