300 Pieces of Silver

 is an unmarked quest in Fallout 3.

If you tell Moriarty you don't have 100 caps to buy information on your father, he 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 Megaton, inside a ranch house in Springvale.

Solutions and rewards
You can go about this situation one of four ways:
 * 1) You can kill her and obtain 400 caps along with her equipment with NO karma change unless you start taking stuff from around the shack.
 * 2) With a successful Speech attempt you can convince her to give you 400 caps to tell Moriarty she's gone.
 * 3) You can convince her to give you 300 caps to tell Moriarty she's gone.
 * 4) You can ask for no money and tell him she's gone this will result in positive karma, though you are still going to have to come up with 100 or 300 caps.
 * 5) You can simply say she's gone without working out a deal with her, though again, you will still have to come up with the money on your own.