Listen to Leanne's story about the Master

 is an unmarked quest in Fallout 2.

Quick walkthrough
Getting and completing this quest is quite simple; when you first talk to Leanne (shes at Becky's casino in the Den, right across from Rebbecca) tell her that your Ancestor was the one who killed "The Master", she will then ask you to buy her a nuka cola, after that she will tell you the story about The Master and you will receive 350xp.

Appearances
appears only in Fallout 2.