Hunt for Hank Madigan
The Missing Link begins with you getting a distress signal from a Firebreather named Hank Madigan. You will be instructed to go to Top of the World to find him. When you approach Top of the World you will be contacted by a woman named Rose via radio. She will give you the quest Signal Strength which must be completed to continue.
Once you complete Signal Strength she will let you use the elevator to access the Observation Level of Top of the World. Here you will find the dead body of Madigan, as well as the NPC Rose who will give you a new quest line that must be completed to progress in The Missing Link.
Raider Quests
At this point you must complete the following quests to proceed in The Missing Link:
Once these quests have been completed you will find the Broken Uplink in the basement of Pleasant Valley Ski Resort, opening up the next objective in the quest.
Next up is Free States Bunker.