Mercer Safehouse

Mercer Safehouse is a Railroad radiant quest in Fallout 4.

Quick walkthrough
After the completion of the mission Boston After Dark given from Doctor Carrington if the player talks to Predictive Analytic Machine (PAM) it will say that for the stability of the Railroad is vital to expand themselves with another settlement. It then proceeds to give the Sole Survivor the task of liberating a random settlement. Once the settlement has been cleared, you will be required to build sufficient defenses for the settlement. 10 defense is required to pass this step. Finally, when that is done, return to PAM for your reward.