Silver's Debt

Silver's Debt is a minor Fallout 3 quest. If you have less than 100 caps, Moriarty will give you a Cap raising task. He wants you to find a woman called Silver and get his money back. You can find Silver at the north-west of Megathon, inside a ranch house.

You reward yourself by taking any actions you want. But best is, convincing Silver, by doing this, she'll give you 400 caps, a nice start for the game.