How to unlock: talk to Edward Deegan. You will find him during day among the buildings with merchants in Bunker Hill (M5,5)
- Talk to Jack Cabot
- Talk to Edward
- Talk to guard captain
- Recover package
- Return serum to Cabot House
Go to Bunker Hill. You must find a military ghoul - Edward Deegan. You can meet him in the middle of the chapel in the center of the location or in his house, from western side.
In first order, you will be sent to Cabot House - Edward first must recommend you, so the quest starts in here. Once you get there, contact with the owner through the intercom at the door. You will be let inside.
The questgiver - Jack Cabot - will give you the details about quest. On his table you can find Zeta gun (theft) which is a rare weapon. Now go to Parsons State Insane Asylum.
At the destination, you will meet chief of security before the entrance (quest marker). Talk to her and she will send you to the nearby location - abandoned Parsons Creamery where at one of the raiders you will find the package you seek - serum. Once you get it, go back to Edward.
You can give Edward the serum or use Charisma to lie to him and keep the serum for yourself (it temporarily increases strength, resistance and reduces radiation, it is worth 25 bottlecaps).
Quest rewards: experience, 100 bottlecaps + 50 if you give the serum back, another quest Emogene Takes a Lover.