Long Time Coming

Long Time Coming is a quest in Fallout 4.

Quick walkthrough

 * 1) Gain Nick's approval
 * 2) Talk to Nick Valentine and accept the quest
 * 3) Find the remaining 9 of Eddie Winter's holotapes, the tapes are in various police stations all across The Commonwealth, e.g. Natick police department, South Boston police department
 * 4) Talk to Nick
 * 5) Travel to Eddie's Hideout which is in Andrew station
 * 6) Open the door to Eddie's hideout
 * 7) Wait for Valentine to finish his conversation, or just shoot Eddie in the head and be done with it
 * 8) Follow Nick and listen to his words

Detailed walkthrough
Nick Valentine is disturbed still by "Nick's" Memories, and tells of an old gangster named Eddie Winters, who used to be one of the largest crime bosses in Boston. Eddie Winters had planned to live forever so he invested into radiation experiment that turned him into a ghoul and he hid in a bunker under a Subway Shop he used to use as a hideout Pre-War. Eddie might've been the first ghoul in existence.

Upon accepting the quest Nick Valentine gives 1 of the 10 holotapes the Sole Survivor needs to get a code to unlock Eddie Winter's Bunker. The remaining nine are in the various police stations in Boston; having them unlocked before reaching the required affection of Nick Valentine could save time.

List of police departments:
 * Natick police department: on the "ground" floor in a filing cabinet in the sunken part
 * South Boston police department 2nd Floor on top of a desk in the corner
 * BADTFL regional office: in the basement on top of a filing cabinet
 * Malden center: on the 2nd floor of the PD in the corner on top of a desk next to a terminal
 * Coast Guard Pier: On the 2nd Floor on top of a safe (Expert).
 * Nahant Sherrif's Department: on top of a filing cabinet right in the front on 2nd floor
 * Quincy police station: As one enters the cell and go down the stairs, in the locker on the end
 * East Boston police station: on the 2nd floor in the southeast desk
 * Police Precinct 8: In a cell on the far right when entering