Listen to Leanne's story about the Master

Listen to Leanne's story about the Master is an unmarked quest in Fallout 2.

Detailed walkthrough
When the Chosen One first talks to Leanne at Becky's casino in the Den (right across from Rebecca), telling her that his ancestor was the one who killed Master, she will then ask him to buy her a Nuka-Cola for $5. Afterwards she will tell the Chosen One the story about the Master and he will receive 350 XP.