One for My Baby

 is a quest in Fallout: New Vegas.

Quick walkthrough
Talk to Boone. He will mention his wife during conversation. Offer to help. Ask No-bark about Boone's wife. He will mention the Dino-Dee-Lite lobby. Sneak in at night and obtain the a Bill of Sale from the safe behind the desk. Ask Jeannie May Crawford to see what is in front of the Dinosaur. Put on your Baret and lead her there. Go back to Boone. After you complete the quest you can ask him to join you and he becomes your companion. He is very useful in combat using a powerful sniper rifle. He gives the Spotter perk when he's with you.

Detailed walkthrough
1. Go to Novac between 9 PM and 9 AM. Find the giant dinosaur and enter it. Once inside, head up the stairs and go through the door at the top. You should meet a man named Boone. Talk to him about his wife and you will receive the quest to find out who sold his wife off to slavers so he may kill them. He also gives you his beret to wear as a signal to fire on the person you bring in front of the Dino.

2. You are then given the task to talk to select inhabitants of Novac. Luckily, you only need to talk to one of them in order to progress in the quest. This person is No-Bark, an older man that seems a little out of his mind. You can find his shack behind the motel.(Its the only newly made structure around so its hard to miss) Talk to No-bark about Boone's wife and he will tell you about strange business in the motel lobby.

3. Head to the front desk of the motel and once inside check behind the counter to find a safe. This safe is locked and will require you to either

A. lock pick it (easy skill) or B. pickpocket the key from Jeannie

Inside the safe you will find a note titled Bill of Sale. This document tells of how Jeannie May Crawford sold Boone's wife off to slavers.

4. Now you have the evidence so confront Jeannie at night and ask her to take a stroll with you in front of the dinosaur. Once in front of the dinosaur put on the beret and Boone will cap Jeannie and your job is done.

5. Head up to Boone. He will ask you how you knew it was her (this is where getting the evidence comes into play) and you tell him about the bill of sale you found. If you did not get the evidence you can use speech on him but if that fails he will try to kill you. If you told him about the evidence you can keep talking to him and he will become your companion.

Bugs
-If you sneak in to the lobby and take the receipt before taking the quest in the game, the optional will automatically finish. The only time you are able to bring jeannie may out is during boones time.

-a fix for this glitch is to wait until she walks outside and then ask her to follow you(PS3)(needs to be confirmed)(Does happen on PS3 as well)-(Confirmed on X360, no option to get her to follow, waited til she walked outside and option became avalialble)