Boston After Dark

Boston After Dark is a quest in Fallout 4.

Quick walkthrough

 * 1) Give Doctor Carrington his prototype.
 * 2) Retrieve the dead drop.
 * 3) Meet Old Man Stockton.
 * 4) Secure the rendezvous point.
 * 5) Wait until nighttime for Old Man Stockton.
 * 6) Wait for Railroad contact.
 * 7) Follow High Rise.
 * 8) Talk with High Rise.
 * 9) Report Back to Doctor Carrington.

Detailed walkthrough
Dr. Carrington asks the Sole Survivor assist with the newest rescued synth. Head to Bunker Hill and talk to Old Man Stockton inside the building. He'll respond to the security phrase with the information, that there are raiders at the drop-off location and asks the Sole Survivor to clear the area. Passing speech-checks can get more caps.

Head to the church that's indicated by the quest marker and kill the raiders, then wait until it's night time. Stockton will bring the synth, and give the all clear sign by lighting a lamp in the window, then he leaves. Talking to the synth doesn't reveal much information, since he'd been told not to talk to anyone. Passing increasingly harder speech-checks reveals, that he's been a maintenance worker at The Institute, and has been treated no better than a tool.

A Railroad operative High Rise arrives and ask for help with the next stage of the mission. Escort him and the synth to the safehouse, there will be raiders to kill along the way. Upon reaching Ticonderoga, they will thank the Sole Survivor for the assistance, and the location will be usable as a safehouse from then on. Speaking to the synth reveals he's scared, but hopeful about his future.

Return to Carrington to receive a reward and the next mission.

Bugs
If you head to the church to "secure the rendevous" and the raiders are dealt with, Stockton may not arrive, leaving the quest unable to be completed.