Emogene Takes a Lover

Emogene Takes a Lover is a side quest in Fallout 4.

Detailed walkthrough
Immediately on completion of Special Delivery Edward requests that the player help find Emogene Cabot, 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 over a hamradio, who is defending the asylum from Raiders - after a few minutes, the radio dies and Jack decides to head to the Asylum with the Sole Survivor to try and stop the Raiders...

Bugs
Brother Thomas unlocks the door to where Emogene is supposed to be but she doesn't appear. Instead the quest points back to Cabot House and the locked section of the house. Check the talk section of the page for a workaround for this bug. NOTE: This is possibly caused by holding onto the first serum however the bug may also occur even if you did not keep the serum. If you execute `fix` commands once you find her missing, the serum will be removed (next quest stage) and you will be able to travel to Cabot House and talk to Jack.

Commands:
 * 1) setstage 000503B9 100
 * 2) setstage 000503B9 70
 * 3) setstage 00022A00 705
 * 4) setstage 00022A00 710
 * 5) setstage 00022A00 720
 * 6) setstage 00022A00 750

If the Sole Survivor already went to Charles View Amphitheater, joined the cult and gave away all of their items to Brother Thomas before taking their revenge on him, then the dialog options during the quest are limited to what they were before the Sole Survivor murdered Brother Thomas for the first time.