- Secure (random settlement location) and then use workshop
- Build defenses
- Report back to PAM
- Varies depending on the location
This quest comes available once you have allied yourself with The Railroad. Speak to PAM at the Old North Church and travel to the location she gives you which will be a random Settlement. Eliminate all hostiles at the settlement and access the Workshop. Build the required defenses (turrets 2x), and travel back to headquarters. You will receive a caps reward and Mercer Safehouse is now available on the world map.