Special Delivery

Special Delivery is a quest in Fallout 4.

Quick walkthrough

 * 1) Go to Cabot House (right hand side of the map)
 * 2) Use the intercom to convince them to let you in.
 * 3) Talk to Edward then to Jack.
 * 4) Talk to Captain Maria at the Insane Asylum
 * 5) Head to Parsons Creamery & deal with the Raiders
 * 6) Go back to Cabot House

Detailed walkthrough
Upon visiting Bunker Hill Edward Deegan will approach and offer work. After accepting go to the Cabot House and use the intercom to gain entry, then speak with Jack Cabot and Edward about the job. A package has gone missing near the insane asylum that's owned by the Cabot family.

Head up to the asylum and question the guard captain, she'll mention that the raiders that stole the serum are at the creamery to the north. Head up there and confront them, if you wait on arrival then a fight will break out between them and they'll thin their numbers.

Kill the remainder, take the serum, return to Cabot House. There is an option to lie to Edward with an easy persuasion check to keep the serum at the cost of a few caps of reward, or it can be turned over. The quest ends either way.