Public Knowledge

Public Knowledge is a side quest in Fallout 4.

Detailed walkthrough
Asking Daisy in Goodneighbor about work reveals that super mutants have taken over the Boston Public Library and she'll pay to have them cleared out. A series of speech checks can be passed to increase the reward from 200 up to 400. She also requests the return of an Overdue book to one of the machines at the library.

There are two entrances to the library: an Advanced locked door on the west side of the building, or going through Copley Station. The library is filled with protectrons and turrets waging war against the invading super mutants. Regardless of which entrance is used, the robots will be hostile to the player as well unless the player speaks to the intercom next to the door prior to entering and passes a speech check to convince it that they are an employee of the library. If this is done at the western door, it will unlock the door as well, meaning Copley Station can be completely avoided with one speech check.

Once inside, an announcement will broadcast saying that super mutants are coming in from the station and the robots will flock to fight them. Once the wave is cleared, then find one of the two book return machines to return the overdue book. After that, return to Daisy to complete the quest.

Bugs

 * If the Sole Survivor returns Daisy's book into any book return terminal outside of the library the quest will keep on telling to return the book in a terminal inside the library even after clearing it of super mutants and the quest tells to return to Daisy. However, this will not affect the quest, as once the Sole Survivor returns to Daisy, the quest will be completed.
 * Be sure to talk with Daisy before you clear out the Boston Public Library; otherwise, the quest cannot be started or completed. However, you will still receive caps for your services.
 * If the Sole Survivor enters the library before starting Daisy's quest and clean up the area, upon return there may be some super mutants present but even if you kill them all the quest doesn't have to update. Easy fix is to advance the quest using SetStage 0010b654 40.
 * Sometimes even after accepting the quest from Daisy, it won't show up anywhere in your quest log. The dialogue option with Daisy to start the quest remains but no matter how many times you accept, it won't appear. You can, however, still complete the quest and obtain both the Caps and Experience reward (as well as adding to your total quests completed) but the quest entry still won't appear in your log.
 * After accepting the quest from Daisy (with animation about it started) you haven't received her overdue book (no text about "Overdue book" added to your inventory). After that may be other bugs started to play.
 * If the Sole Survivor accepts the quest but returns any book into a book return terminal outside of the library before completing the quest then quest would disappear from your quest log. The dialogue option with Daisy to start the quest remains and after cleaning the library you could say to her that you already did the job and receive your caps and experience, but quest itself would be missed from list of completed.

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