Starfield:Secret Lives

Quick Walkthrough

 * 1) Agree to meet Wyatt Earp in private.
 * 2) Kill or talk down H. H. Holmes.

Detailed Walkthrough
After talking to Amanirenas, Genghis Khan, and Franklin Delano Roosevelt, Wyatt Earp will approach you, claiming that Roosevelt is hiding something from you, and asking to meet you in secret before you head to the Facility. He directs you to a cave just outside of Crucible.

Upon meeting you in the cave, Earp reveals his secret - he's not a clone of Wyatt Earp at all, but rather a clone of Henry Howard Holmes, the notorious 19th century American serial killer. Terrified of what the other residents of Crucible might do to him if they found out, he claimed to be a clone of Wyatt Earp as a cover. He then says that he couldn't risk you discovering his secret at the Facility, and that he plans to kill you to conceal his true identity.

Despite his namesake, Holmes is clearly no killer, and is obviously terrified of the idea of fighting you. It is possible to talk him down by passing a speech challenge and promising to keep his secret. Otherwise, you will have to kill him.