Emogene Takes a Lover

Emogene Takes a Lover is a quest in Fallout 4.

Quick walkthrough

 * 1) After completing mission Special Delivery talk to Edward at Cabot House.
 * 2) Go to The Third Rail in Goodneighbor (Optional) and talk to Whitechapel Charlie & Magnolia.
 * 3) Go to the Charles View Amphitheater & talk to Brother Thomas.
 * 4) Go Back to Cabot House and talk to Jack.

Detailed walkthrough
Immediately on completion of Special Delivery Edward requests that the player help find Emogene, who is apparently prone to running off with new boyfriends, over the objections of Jack. Edward advises that Emogene likes to spend time in Goodneighbor at The Third Rail.

Talking to the bartender at The Third Rail results in being pointed to Magnolia, talking to her results in the player getting a flyer from Ham pointing the way to Brother Thomas, a religious leader that seems to have recruited Emogene.

It's a short walk to the Charles View Amphitheater where Thomas is holed up, speaking with him results in a few options being presented, bribery, persuasion,or threatening Thomas. You could also simply go around back and pick the lock on the door to set her free.

Once Emogene is free she'll tell the player about the purpose of the serum, then leave on her own. The player can go back to Cabot house and turn in the quest. On arrival Jack is talking to Edward, who is defending the asylum from attackers.

Bugs
Brother Thomas unlocks the door to where Emogene is supposed to be but she doesn't appear. Instead the quest points to back Cabot House and the locked section of the house.