Long Time Coming

Long Time Coming is a companion quest in Fallout 4.

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 and as such, invested into a radiation experiment that turned him into a ghoul and subsequently hid in a bunker under a Subway Shop he used as a hideout Pre-War. It is possible Eddie might have 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 can save time.

List of police departments and locations of the holotapes :
 * Natick Police Department: On the ground floor, in a locker, in the sunken part of the building.
 * South Boston Police Department : On the 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 police department, in the corner, on top of a desk next to a terminal.
 * Coast Guard Pier: On the 2nd floor on top of an Expert locked safe.
 * Nahant Sheriff's Department: On top of a filing cabinet right in the front on the 2nd floor.
 * Quincy Police Station: As one enters the cell and goes 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 the building.

Bugs

 * There is a bug where Nick might just sit on the ground after killing Eddie. (to fix this sit on the couch nearby and wait 1 hour, if the issue persists outside then sit and wait 24 hours.)
 * There is another bug where Nick stands still and cannot be interacted with. This can be resolved by attacking Nick until he runs out of health and sits on the ground (he will not die or become hostile). Once he recovers, the quest will continue as intended.
 * After receiving all 10 holotapes and give them to Nick, he will disappear to nowhere. He will reappear again in Eddie's lair upon the quest progress. (NOTE: Not a bug, but part of the quest. There is even a notification, warning that he will leave your company for an unspecified time, during the conversation where you give him the holotapes.)
 * There´s another bug where if you start a certain battle in the vicinity of BADTFL Regional Office you can't go in and get your holotape because the game crashes.

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