Returning the Favor

Returning the Favor is a quest in Fallout 4.

Quick walkthrough

 * 1) Speak with Preston Garvey or Blake Abernathy to get this quest.
 * 2) Retrieve the locket for the USAF Satellite Station Olivia.
 * 3) Return to Blake Abernathy.

Detailed walkthrough
Speak with Preston Garvey at Sanctuary Hills to receive this as a Minuteman quest or speak directly to Blake Abernathy. The player character learns that Mr. Abernathy's daughter Mary Abernathy was killed by raiders, and he and his family would love to retrieve her locket. The player character is sent to the USAF Satellite Station Olivia. Upon entrance to the building, there is an advanced terminal which unlocks the intel room. If the player character does not have the necessary perk to unlock the advanced terminal, the intel room key can be found in an instrument case through a novice door by where the locket is found. Inside the intel room there is a novice safe, a Duffle bag, and a Trunk. The player character can go either right down the stairs o left down the hallway. Turning left leads to a metal walkway, passing a bathroom with a first aid kit in it. There is a novice chem box at the farthest right end of the walkway. Descending down the walkway leads to an encounter with Ack-Ack, who carries a Minigun (Fallout 4). In the room with the lockers, on the table with the radio, there is an Overdue book. Mary's locket can be found in a toolbox in front of a novice door. After unlocking the door, the player character will be attacked by radroaches, including a legendary radroach that carries the Assassin's machete. In this room there is the intel room key, a RadAway tucked between some radioactive barrels and a first aid kit in between another set of barrels. Returning to Blake Abernathy earns the player a small reward in caps, XP, the use of the workbench, and the support of the Abernathy farm for the Minutemen.

When receiving the quest from Blake Abernathy

 * Retrieve Mary's Locket in USAF Satellite Station Olivia.
 * Report your success to Blake Abernathy.